diff --git a/companion/src/firmwares/opentx/opentxeeprom.cpp b/companion/src/firmwares/opentx/opentxeeprom.cpp
index f24be19f3..c7ebf0fa2 100644
--- a/companion/src/firmwares/opentx/opentxeeprom.cpp
+++ b/companion/src/firmwares/opentx/opentxeeprom.cpp
@@ -40,11 +40,11 @@ inline int switchIndex(int i, BoardEnum board, unsigned int version)
 class SwitchesConversionTable: public ConversionTable {
 
   public:
-    SwitchesConversionTable(BoardEnum board, unsigned int version, unsigned long flags=0)
+    SwitchesConversionTable(BoardEnum board, unsigned int version, bool timer=false)
     {
       int val=0;
       int offset=0;
-      if (flags & POPULATE_TIMER_MODES) {
+      if (timer) {
         offset = 4;
         for (int i=0; i<5; i++) {
           addConversion(RawSwitch(SWITCH_TYPE_TIMER_MODE, i), val++);
@@ -93,17 +93,15 @@ class SwitchesConversionTable: public ConversionTable {
         addConversion(RawSwitch(SWITCH_TYPE_VIRTUAL, i), val++);
       }
 
-      if (!(flags & POPULATE_TIMER_MODES)) {
-        addConversion(RawSwitch(SWITCH_TYPE_OFF), -val+offset);
-        addConversion(RawSwitch(SWITCH_TYPE_ON), val++);
-        if (version >= 216) {
-          addConversion(RawSwitch(SWITCH_TYPE_ONE, -1), -val+offset);
-          addConversion(RawSwitch(SWITCH_TYPE_ONE, 1), val++);
-          if (IS_ARM(board)) {
-            for (int i=1; i<=MAX_FLIGHT_MODES(board, version); i++) {
-              addConversion(RawSwitch(SWITCH_TYPE_FLIGHT_MODE, -i), -val+offset);
-              addConversion(RawSwitch(SWITCH_TYPE_FLIGHT_MODE, i), val++);
-            }
+      addConversion(RawSwitch(SWITCH_TYPE_OFF), -val+offset);
+      addConversion(RawSwitch(SWITCH_TYPE_ON), val++);
+      if (version >= 216) {
+        addConversion(RawSwitch(SWITCH_TYPE_ONE, -1), -val+offset);
+        addConversion(RawSwitch(SWITCH_TYPE_ONE, 1), val++);
+        if (IS_ARM(board)) {
+          for (int i=1; i<=MAX_FLIGHT_MODES(board, version); i++) {
+            addConversion(RawSwitch(SWITCH_TYPE_FLIGHT_MODE, -i), -val+offset);
+            addConversion(RawSwitch(SWITCH_TYPE_FLIGHT_MODE, i), val++);
           }
         }
       }
@@ -2429,7 +2427,7 @@ OpenTxModelData::OpenTxModelData(ModelData & modelData, BoardEnum board, unsigne
   }
 
   for (int i=0; i<O9X_MAX_TIMERS; i++) {
-    internalField.Append(new SwitchField<8>(modelData.timers[i].mode, board, version, POPULATE_TIMER_MODES));
+    internalField.Append(new SwitchField<8>(modelData.timers[i].mode, board, version, true));
     if ((IS_ARM(board) || IS_2560(board)) && version >= 216) {
       internalField.Append(new UnsignedField<16>(modelData.timers[i].val));
       internalField.Append(new UnsignedField<2>(modelData.timers[i].countdownBeep));
diff --git a/companion/src/helpers.cpp b/companion/src/helpers.cpp
index 4111fb14f..686807f20 100644
--- a/companion/src/helpers.cpp
+++ b/companion/src/helpers.cpp
@@ -378,13 +378,13 @@ void populateBacklightCB(QComboBox *b, const uint8_t value)
   }
 }
 
-void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettings & generalSettings, unsigned long attr)
+void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettings & generalSettings, SwitchContext context)
 {
   RawSwitch item;
 
   b->clear();
 
-  if (attr & POPULATE_ONOFF) {
+  if (context != MixesContext) {
     // !FMx
     if (IS_ARM(GetCurrentFirmware()->getBoard())) {
       for (int i=-GetCurrentFirmware()->getCapability(FlightModes); i<0; i++) {
@@ -393,14 +393,6 @@ void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettin
         if (item == value) b->setCurrentIndex(b->count()-1);
       }
     }
-    // !One
-    item = RawSwitch(SWITCH_TYPE_ONE, 1);
-    b->addItem(item.toString(), item.toValue());
-    if (item == value) b->setCurrentIndex(b->count()-1);
-    // OFF
-    item = RawSwitch(SWITCH_TYPE_OFF);
-    b->addItem(item.toString(), item.toValue());
-    if (item == value) b->setCurrentIndex(b->count()-1);
   }
 
   for (int i=-GetCurrentFirmware()->getCapability(LogicalSwitches); i<0; i++) {
@@ -435,13 +427,13 @@ void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettin
     item = RawSwitch(SWITCH_TYPE_SWITCH, i);
     if (IS_TARANIS(GetCurrentFirmware()->getBoard())) {
       //hide up and down for !SH and !SF, because they are redundant (!SFup == SFdown)
-      if (item.toString().contains("H") || item.toString().contains("F"))  continue;
+      if (item.toString().contains("H") || item.toString().contains("F")) continue;
     }
     b->addItem(item.toString(), item.toValue());
     if (item == value) b->setCurrentIndex(b->count()-1);
   }
 
-  if (attr & POPULATE_TIMER_MODES) {
+  if (context == TimersContext) {
     for (int i=0; i<5; i++) {
       item = RawSwitch(SWITCH_TYPE_TIMER_MODE, i);
       b->addItem(item.toString(), item.toValue());
@@ -488,7 +480,7 @@ void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettin
     if (item == value) b->setCurrentIndex(b->count()-1);
   }
 
-  if (attr & POPULATE_ONOFF) {
+  if (context == CustomFunctionsContext) {
     // ON
     item = RawSwitch(SWITCH_TYPE_ON);
     b->addItem(item.toString(), item.toValue());
@@ -497,7 +489,10 @@ void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettin
     item = RawSwitch(SWITCH_TYPE_ONE, 1);
     b->addItem(item.toString(), item.toValue());
     if (item == value) b->setCurrentIndex(b->count()-1);
-    // FMx
+  }
+
+  // FMx
+  if (context != MixesContext) {
     if (IS_ARM(GetCurrentFirmware()->getBoard())) {
       for (int i=1; i<=GetCurrentFirmware()->getCapability(FlightModes); i++) {
         item = RawSwitch(SWITCH_TYPE_FLIGHT_MODE, i);
diff --git a/companion/src/helpers.h b/companion/src/helpers.h
index 888735db9..852e18811 100644
--- a/companion/src/helpers.h
+++ b/companion/src/helpers.h
@@ -6,7 +6,7 @@
 
 extern const QColor colors[C9X_MAX_CURVES];
 
-#define TMR_NUM_OPTION  (TMR_VAROFS+2*9+2*GetCurrentFirmware()->getCapability(LogicalSwitches)-1)
+#define TMR_NUM_OPTION  (TMRMODE_COUNT+2*9+2*GetCurrentFirmware()->getCapability(LogicalSwitches)-1)
 
 //convert from mode 1 to mode generalSettings.stickMode
 //NOTICE!  =>  1..4 -> 1..4
@@ -81,9 +81,15 @@ class CurveGroup : public QObject {
     int lastType;
 };
 
-#define POPULATE_ONOFF        0x01
-#define POPULATE_TIMER_MODES  0x02
-void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettings & generalSettings, unsigned long attr=0);
+enum SwitchContext
+{
+  LogicalSwitchesContext,
+  CustomFunctionsContext,
+  TimersContext,
+  MixesContext
+};
+
+void populateSwitchCB(QComboBox *b, const RawSwitch & value, const GeneralSettings & generalSettings, SwitchContext context);
 
 void populatePhasesCB(QComboBox *b, int value);
 void populateGvarUseCB(QComboBox *b, unsigned int phase);
diff --git a/companion/src/modeledit/customfunctions.cpp b/companion/src/modeledit/customfunctions.cpp
index 94f1bf0fb..7985b0f2e 100644
--- a/companion/src/modeledit/customfunctions.cpp
+++ b/companion/src/modeledit/customfunctions.cpp
@@ -506,7 +506,7 @@ void CustomFunctionsPanel::update()
   lock = true;
   for (int i=0; i<firmware->getCapability(CustomFunctions); i++) {
     if (!initialized) {
-      populateSwitchCB(fswtchSwtch[i], model.funcSw[i].swtch, generalSettings, POPULATE_ONOFF);
+      populateSwitchCB(fswtchSwtch[i], model.funcSw[i].swtch, generalSettings, CustomFunctionsContext);
       populateFuncCB(fswtchFunc[i], model.funcSw[i].func);
       populateGVmodeCB(fswtchGVmode[i], model.funcSw[i].adjustMode);
       populateFuncParamCB(fswtchParamT[i], model, model.funcSw[i].func, model.funcSw[i].param, model.funcSw[i].adjustMode);
@@ -527,7 +527,7 @@ void CustomFunctionsPanel::fswPaste()
     FuncSwData *fsw = &model.funcSw[selectedFunction];
     memcpy(fsw, fswData.mid(0, sizeof(FuncSwData)).constData(), sizeof(FuncSwData));
     lock = true;
-    populateSwitchCB(fswtchSwtch[selectedFunction], model.funcSw[selectedFunction].swtch, generalSettings, POPULATE_ONOFF);
+    populateSwitchCB(fswtchSwtch[selectedFunction], model.funcSw[selectedFunction].swtch, generalSettings, CustomFunctionsContext);
     populateFuncCB(fswtchFunc[selectedFunction], model.funcSw[selectedFunction].func);
     populateGVmodeCB(fswtchGVmode[selectedFunction], model.funcSw[selectedFunction].adjustMode);
     populateFuncParamCB(fswtchParamT[selectedFunction], model, model.funcSw[selectedFunction].func, model.funcSw[selectedFunction].param, model.funcSw[selectedFunction].adjustMode);
@@ -543,7 +543,7 @@ void CustomFunctionsPanel::fswDelete()
   model.funcSw[selectedFunction].clear();
   // TODO update switch and func
   lock = true;
-  populateSwitchCB(fswtchSwtch[selectedFunction], model.funcSw[selectedFunction].swtch, generalSettings, POPULATE_ONOFF);
+  populateSwitchCB(fswtchSwtch[selectedFunction], model.funcSw[selectedFunction].swtch, generalSettings, CustomFunctionsContext);
   populateFuncCB(fswtchFunc[selectedFunction], model.funcSw[selectedFunction].func);
   refreshCustomFunction(selectedFunction);
   lock = false;
diff --git a/companion/src/modeledit/expodialog.cpp b/companion/src/modeledit/expodialog.cpp
index 3ae8177cb..6586c6ef3 100644
--- a/companion/src/modeledit/expodialog.cpp
+++ b/companion/src/modeledit/expodialog.cpp
@@ -33,7 +33,7 @@ ExpoDialog::ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expoData, G
 
   curveGroup = new CurveGroup(ui->curveTypeCB, ui->curveGVarCB, ui->curveValueCB, ui->curveValueSB, ed->curve);
 
-  populateSwitchCB(ui->switchesCB, ed->swtch, generalSettings);
+  populateSwitchCB(ui->switchesCB, ed->swtch, generalSettings, MixesContext);
 
   ui->sideCB->setCurrentIndex(ed->mode-1);
 
diff --git a/companion/src/modeledit/flightmodes.cpp b/companion/src/modeledit/flightmodes.cpp
index 8e8797f54..c7b59a372 100644
--- a/companion/src/modeledit/flightmodes.cpp
+++ b/companion/src/modeledit/flightmodes.cpp
@@ -30,7 +30,7 @@ FlightModePanel::FlightModePanel(QWidget * parent, ModelData & model, int phaseI
 
   // Phase switch
   if (phaseIdx > 0) {
-    populateSwitchCB(ui->swtch, phase.swtch, generalSettings);
+    populateSwitchCB(ui->swtch, phase.swtch, generalSettings, MixesContext);
     connect(ui->swtch, SIGNAL(currentIndexChanged(int)), this, SLOT(phaseSwitch_currentIndexChanged(int)));
   }
   else {
diff --git a/companion/src/modeledit/logicalswitches.cpp b/companion/src/modeledit/logicalswitches.cpp
index 5768426ee..2286dc1be 100644
--- a/companion/src/modeledit/logicalswitches.cpp
+++ b/companion/src/modeledit/logicalswitches.cpp
@@ -324,12 +324,12 @@ void LogicalSwitchesPanel::setSwitchWidgetVisibility(int i)
       // no break
     case LS_FAMILY_VBOOL:
       mask |= SOURCE1_VISIBLE | SOURCE2_VISIBLE;
-      populateSwitchCB(cswitchSource1[i], RawSwitch(model.customSw[i].val1), generalSettings);
-      populateSwitchCB(cswitchSource2[i], RawSwitch(model.customSw[i].val2), generalSettings);
+      populateSwitchCB(cswitchSource1[i], RawSwitch(model.customSw[i].val1), generalSettings, LogicalSwitchesContext);
+      populateSwitchCB(cswitchSource2[i], RawSwitch(model.customSw[i].val2), generalSettings, LogicalSwitchesContext);
       break;
     case LS_FAMILY_STAY:
       mask |= SOURCE1_VISIBLE | VALUE2_VISIBLE | VALUE3_VISIBLE;
-      populateSwitchCB(cswitchSource1[i], RawSwitch(model.customSw[i].val1), generalSettings);
+      populateSwitchCB(cswitchSource1[i], RawSwitch(model.customSw[i].val1), generalSettings, LogicalSwitchesContext);
       updateTimerParam(cswitchOffset[i], model.customSw[i].val2, 0.0);
       updateTimerParam(cswitchOffset2[i], model.customSw[i].val2+model.customSw[i].val3, cswitchOffset[i]->value());
       if (model.customSw[i].val3 == 0) {
@@ -410,7 +410,7 @@ void LogicalSwitchesPanel::populateCSWCB(QComboBox *b, int value)
 void LogicalSwitchesPanel::populateAndSwitchCB(QComboBox *b, const RawSwitch & value)
 {
   if (IS_ARM(firmware->getBoard())) {
-    populateSwitchCB(b, value, generalSettings, POPULATE_ONOFF);
+    populateSwitchCB(b, value, generalSettings, LogicalSwitchesContext);
   }
   else {
     RawSwitch item;
diff --git a/companion/src/modeledit/mixerdialog.cpp b/companion/src/modeledit/mixerdialog.cpp
index 75ea388ac..421d034f3 100644
--- a/companion/src/modeledit/mixerdialog.cpp
+++ b/companion/src/modeledit/mixerdialog.cpp
@@ -76,7 +76,7 @@ MixerDialog::MixerDialog(QWidget *parent, ModelData & model, MixData *mixdata, G
       }
     }
 
-    populateSwitchCB(ui->switchesCB, md->swtch, generalSettings);
+    populateSwitchCB(ui->switchesCB, md->swtch, generalSettings, MixesContext);
     ui->warningCB->setCurrentIndex(md->mixWarn);
     ui->mltpxCB->setCurrentIndex(md->mltpx);
     int scale=firmware->getCapability(SlowScale);  
diff --git a/companion/src/modeledit/setup.cpp b/companion/src/modeledit/setup.cpp
index 38326a0ad..79703c9f6 100644
--- a/companion/src/modeledit/setup.cpp
+++ b/companion/src/modeledit/setup.cpp
@@ -15,7 +15,7 @@ TimerPanel::TimerPanel(QWidget *parent, ModelData & model, TimerData & timer, Ge
   lock = true;
 
   // Mode
-  populateSwitchCB(ui->mode, timer.mode, generalSettings, POPULATE_TIMER_MODES);
+  populateSwitchCB(ui->mode, timer.mode, generalSettings, TimersContext);
 
   if (!firmware->getCapability(PermTimers)) {
     ui->persistent->hide();
diff --git a/radio/src/eeprom_conversions.cpp b/radio/src/eeprom_conversions.cpp
index aa1a56bd7..cdf0c3771 100644
--- a/radio/src/eeprom_conversions.cpp
+++ b/radio/src/eeprom_conversions.cpp
@@ -472,8 +472,8 @@ void ConvertModel_215_to_216(ModelData &model)
   memcpy(&g_model.header, &oldModel.header, sizeof(g_model.header));
   for (uint8_t i=0; i<2; i++) {
     TimerData & timer = g_model.timers[i];
-    if (oldModel.timers[i].mode >= TMRMODE_FIRST_SWITCH)
-      timer.mode = TMRMODE_FIRST_SWITCH + ConvertSwitch_215_to_216(oldModel.timers[i].mode - TMRMODE_FIRST_SWITCH + 1) - 1;
+    if (oldModel.timers[i].mode >= TMRMODE_COUNT)
+      timer.mode = TMRMODE_COUNT + ConvertSwitch_215_to_216(oldModel.timers[i].mode - TMRMODE_COUNT + 1) - 1;
     else
       timer.mode = oldModel.timers[i].mode;
     timer.start = oldModel.timers[i].start;
diff --git a/radio/src/gui/menu_model.cpp b/radio/src/gui/menu_model.cpp
index ac9c02331..f608c38bd 100644
--- a/radio/src/gui/menu_model.cpp
+++ b/radio/src/gui/menu_model.cpp
@@ -1120,7 +1120,7 @@ void menuModelSetup(uint8_t event)
             div_t qr = div(timer->start, 60);
             switch (m_posHorz) {
               case 0:
-                CHECK_INCDEC_MODELVAR(event, timer->mode, SWSRC_FIRST, TMR_VAROFS+SWSRC_LAST-1);
+                CHECK_INCDEC_MODELVAR_CHECK(event, timer->mode, SWSRC_FIRST, TMRMODE_COUNT+SWSRC_LAST-1/*SWSRC_None removed*/, isSwitchAvailableInTimers);
                 break;
               case 1:
                 CHECK_INCDEC_MODELVAR_ZERO(event, qr.quot, 59);
@@ -1940,7 +1940,7 @@ void menuModelFlightModesAll(uint8_t event)
 
         case ITEM_FLIGHT_MODES_SWITCH:
           putsSwitches((5+LEN_FP_NAME)*FW+FW/2, y, p->swtch, attr);
-          if (active) CHECK_INCDEC_MODELSWITCH(event, p->swtch, SWSRC_FIRST_SHORT_LIST, SWSRC_LAST_SHORT_LIST);
+          if (active) CHECK_INCDEC_MODELSWITCH(event, p->swtch, SWSRC_FIRST_IN_MIXES, SWSRC_LAST_IN_MIXES, isSwitchAvailableInMixes);
           break;
 
         case ITEM_FLIGHT_MODES_TRIM_RUD:
@@ -4691,8 +4691,8 @@ void menuModelLogicalSwitches(uint8_t event)
     if (cstate == LS_FAMILY_BOOL || cstate == LS_FAMILY_STICKY) {
       putsSwitches(CSW_2ND_COLUMN, y, cs->v1, attr1);
       putsSwitches(CSW_3RD_COLUMN, y, cs->v2, attr2);
-      v1_min = SWSRC_OFF+1; v1_max = SWSRC_ON-1;
-      v2_min = SWSRC_OFF+1; v2_max = SWSRC_ON-1;
+      v1_min = SWSRC_FIRST_IN_LOGICAL_SWITCHES; v1_max = SWSRC_LAST_IN_LOGICAL_SWITCHES;
+      v2_min = SWSRC_FIRST_IN_LOGICAL_SWITCHES; v2_max = SWSRC_LAST_IN_LOGICAL_SWITCHES;
       INCDEC_SET_FLAG(INCDEC_SWITCH);
       INCDEC_ENABLE_CHECK(isSwitchAvailableInLogicalSwitches);
     }
@@ -4707,12 +4707,12 @@ void menuModelLogicalSwitches(uint8_t event)
       else
         lcd_outdezAtt(lcdLastPos+3, y, lswTimerValue(cs->v2+cs->v3), LEFT|PREC1|(horz==LS_FIELD_V3 ? attr : 0));
       lcd_putc(lcdLastPos, y, ']');
-      v1_min = SWSRC_OFF+1; v1_max = SWSRC_ON-1;
+      v1_min = SWSRC_FIRST_IN_LOGICAL_SWITCHES; v1_max = SWSRC_LAST_IN_LOGICAL_SWITCHES;
       v2_min=-129; v2_max = 122;
       v3_max = 222 - cs->v2;
       if (horz == 1) {
         INCDEC_SET_FLAG(INCDEC_SWITCH);
-        INCDEC_ENABLE_CHECK(isSwitchAvailable);
+        INCDEC_ENABLE_CHECK(isSwitchAvailableInLogicalSwitches);
       }
       else {
         INCDEC_SET_FLAG(0);
@@ -5042,7 +5042,7 @@ void menuModelCustomFunctions(uint8_t event)
       switch (j) {
         case 0:
           putsSwitches(MODEL_CUSTOM_FUNC_1ST_COLUMN, y, CFN_SWITCH(sd), attr | ((activeFnSwitches & ((MASK_CFN_TYPE)1 << k)) ? BOLD : 0));
-          if (active || AUTOSWITCH_ENTER_LONG()) CHECK_INCDEC_MODELSWITCH(event, CFN_SWITCH(sd), SWSRC_FIRST, SWSRC_LAST);
+          if (active || AUTOSWITCH_ENTER_LONG()) CHECK_INCDEC_MODELSWITCH(event, CFN_SWITCH(sd), SWSRC_FIRST, SWSRC_LAST, isSwitchAvailableInCustomFunctions);
           break;
 
         case 1:
diff --git a/radio/src/gui/menus.cpp b/radio/src/gui/menus.cpp
index 9eef676be..f90d3eca1 100644
--- a/radio/src/gui/menus.cpp
+++ b/radio/src/gui/menus.cpp
@@ -1117,7 +1117,7 @@ int8_t switchMenuItem(uint8_t x, uint8_t y, int8_t value, LcdFlags attr, uint8_t
 {
   lcd_putsColumnLeft(x, y, STR_SWITCH);
   putsSwitches(x,  y, value, attr);
-  if (attr) CHECK_INCDEC_MODELSWITCH(event, value, SWSRC_FIRST_SHORT_LIST, SWSRC_LAST_SHORT_LIST);
+  if (attr) CHECK_INCDEC_MODELSWITCH(event, value, SWSRC_FIRST_IN_MIXES, SWSRC_LAST_IN_MIXES, isSwitchAvailableInMixes);
   return value;
 }
 
@@ -1488,17 +1488,25 @@ bool isInputSourceAvailable(int source)
   return false;
 }
 
-bool isSwitchAvailableInLogicalSwitches(int swtch)
+enum SwitchContext
+{
+  LogicalSwitchesContext,
+  CustomFunctionsContext,
+  TimersContext,
+  MixesContext
+};
+
+bool isSwitchAvailable(int swtch, SwitchContext context)
 {
   if (swtch < 0) {
-    if (swtch <= -SWSRC_ON)
-      return false;
 #if defined(PCBTARANIS)
-    else if (swtch == -SWSRC_SF0 || swtch == -SWSRC_SF2 || swtch == -SWSRC_SH0 || swtch == -SWSRC_SH2)
+    if (swtch == -SWSRC_SF0 || swtch == -SWSRC_SF2 || swtch == -SWSRC_SH0 || swtch == -SWSRC_SH2)
       return false;
 #endif
-    else
-      swtch = -swtch;
+    if (swtch == -SWSRC_ON || swtch == -SWSRC_One) {
+      return false;
+    }
+    swtch = -swtch;
   }
 
 #if defined(PCBTARANIS)
@@ -1514,27 +1522,59 @@ bool isSwitchAvailableInLogicalSwitches(int swtch)
   }
 #endif
 
-  return true;
-}
-
-bool isSwitchAvailable(int swtch)
-{
-  if (!isSwitchAvailableInLogicalSwitches(swtch)) {
-    return false;
-  }
-
-  if (swtch < 0) {
-    swtch = -swtch;
-  }
-
-  if (swtch >= SWSRC_FIRST_LOGICAL_SWITCH && swtch <= SWSRC_LAST_LOGICAL_SWITCH) {
+  if (context != LogicalSwitchesContext && swtch >= SWSRC_FIRST_LOGICAL_SWITCH && swtch <= SWSRC_LAST_LOGICAL_SWITCH) {
     LogicalSwitchData * cs = lswAddress(swtch-SWSRC_FIRST_LOGICAL_SWITCH);
     return (cs->func != LS_FUNC_NONE);
   }
+
+  if (context != CustomFunctionsContext && (swtch == SWSRC_ON || swtch == SWSRC_One)) {
+    return false;
+  }
+
+  if (swtch >= SWSRC_FIRST_FLIGHT_MODE && swtch <= SWSRC_LAST_FLIGHT_MODE) {
+    if (context == MixesContext) {
+      return false;
+    }
+    else {
+      swtch -= SWSRC_FIRST_FLIGHT_MODE;
+      if (swtch == 0) {
+        return true;
+      }
+      FlightModeData * fm = flightModeAddress(swtch);
+      return (fm->swtch != SWSRC_NONE);
+    }
+  }
   
   return true;
 }
 
+bool isSwitchAvailableInLogicalSwitches(int swtch)
+{
+  return isSwitchAvailable(swtch, LogicalSwitchesContext);
+}
+
+bool isSwitchAvailableInCustomFunctions(int swtch)
+{
+  return isSwitchAvailable(swtch, CustomFunctionsContext);
+}
+
+bool isSwitchAvailableInMixes(int swtch)
+{
+  return isSwitchAvailable(swtch, MixesContext);
+}
+
+bool isSwitchAvailableInTimers(int swtch)
+{
+  if (swtch >= 0) {
+    if (swtch < TMRMODE_COUNT) {
+      return true;
+    }
+    swtch -= TMRMODE_COUNT-1;
+  }
+
+  return isSwitchAvailable(swtch, TimersContext);
+}
+
 bool isThrottleSourceAvailable(int source)
 {
 #if defined(PCBTARANIS)
diff --git a/radio/src/gui/menus.h b/radio/src/gui/menus.h
index 12db06fae..f29c2ea20 100644
--- a/radio/src/gui/menus.h
+++ b/radio/src/gui/menus.h
@@ -209,9 +209,13 @@ int8_t checkIncDecGen(uint8_t event, int8_t i_val, int8_t i_min, int8_t i_max);
   var = checkIncDecModelZero(event,var,max)
 
 #if defined(CPUARM)
+  #define CHECK_INCDEC_MODELVAR_CHECK(event, var, min, max, check) \
+    var = checkIncDec(event, var, min, max, EE_MODEL, check)
   #define CHECK_INCDEC_MODELVAR_ZERO_CHECK(event, var, max, check) \
     var = checkIncDec(event, var, 0, max, EE_MODEL, check)
 #else
+  #define CHECK_INCDEC_MODELVAR_CHECK(event, var, min, max, check) \
+    var = checkIncDec(event, var, min, max, EE_MODEL)
   #define CHECK_INCDEC_MODELVAR_ZERO_CHECK(event, var, max, check) \
     CHECK_INCDEC_MODELVAR_ZERO(event, var, max)
 #endif
@@ -220,19 +224,22 @@ int8_t checkIncDecGen(uint8_t event, int8_t i_val, int8_t i_min, int8_t i_max);
   bool isThrottleSourceAvailable(int source);
   bool isLogicalSwitchFunctionAvailable(int function);
   bool isAssignableFunctionAvailable(int function);
-  bool isSwitchAvailable(int swtch);
   bool isSwitchAvailableInLogicalSwitches(int swtch);
+  bool isSwitchAvailableInCustomFunctions(int swtch);
+  bool isSwitchAvailableInMixes(int swtch);
+  bool isSwitchAvailableInTimers(int swtch);
   bool isModuleAvailable(int module);
   #define AUTOSWITCH_ENTER_LONG() (attr && event==EVT_KEY_LONG(KEY_ENTER))
-  #define CHECK_INCDEC_MODELSWITCH(event, var, min, max) \
-    var = checkIncDec(event,var,min,max,EE_MODEL|INCDEC_SWITCH|NO_INCDEC_MARKS, isSwitchAvailable)
+  #define CHECK_INCDEC_MODELSWITCH(event, var, min, max, available) \
+    var = checkIncDec(event,var,min,max,EE_MODEL|INCDEC_SWITCH|NO_INCDEC_MARKS, available)
 #elif defined(AUTOSWITCH)
   #define AUTOSWITCH_ENTER_LONG() (attr && event==EVT_KEY_LONG(KEY_ENTER))
-  #define CHECK_INCDEC_MODELSWITCH(event, var, min, max) \
+  #define CHECK_INCDEC_MODELSWITCH(event, var, min, max, available) \
     var = checkIncDec(event,var,min,max,EE_MODEL|INCDEC_SWITCH)
 #else
   #define AUTOSWITCH_ENTER_LONG() (0)
-  #define CHECK_INCDEC_MODELSWITCH CHECK_INCDEC_MODELVAR
+  #define CHECK_INCDEC_MODELSWITCH(event, var, min, max, available) \
+    CHECK_INCDEC_MODELVAR(event, var, min, max)
 #endif
 
 #if defined(CPUARM)
diff --git a/radio/src/lcd_common.cpp b/radio/src/lcd_common.cpp
index c3b4d3443..283409a58 100644
--- a/radio/src/lcd_common.cpp
+++ b/radio/src/lcd_common.cpp
@@ -843,10 +843,10 @@ void putsCurve(xcoord_t x, uint8_t y, int8_t idx, LcdFlags att)
 void putsTimerMode(xcoord_t x, uint8_t y, int8_t mode, LcdFlags att)
 {
   if (mode >= 0) {
-    if (mode < TMR_VAROFS)
+    if (mode < TMRMODE_COUNT)
       return lcd_putsiAtt(x, y, STR_VTMRMODES, mode, att);
     else
-      mode -= (TMR_VAROFS-1);
+      mode -= (TMRMODE_COUNT-1);
   }
   putsSwitches(x, y, mode, att);
 }
diff --git a/radio/src/myeeprom.h b/radio/src/myeeprom.h
index b68a773ff..54e831b45 100644
--- a/radio/src/myeeprom.h
+++ b/radio/src/myeeprom.h
@@ -1451,8 +1451,15 @@ enum SwitchSources {
   SWSRC_LAST = SWSRC_COUNT-1,
   SWSRC_FIRST = -SWSRC_LAST,
 
-  SWSRC_LAST_SHORT_LIST = SWSRC_LAST_LOGICAL_SWITCH,
-  SWSRC_FIRST_SHORT_LIST = -SWSRC_LAST_SHORT_LIST,
+#if defined(CPUARM)
+  SWSRC_LAST_IN_LOGICAL_SWITCHES = SWSRC_LAST_FLIGHT_MODE,
+  SWSRC_LAST_IN_MIXES = SWSRC_LAST_FLIGHT_MODE,
+#else
+  SWSRC_LAST_IN_LOGICAL_SWITCHES = SWSRC_LAST_LOGICAL_SWITCH,
+  SWSRC_LAST_IN_MIXES = SWSRC_LAST_LOGICAL_SWITCH,
+#endif
+  SWSRC_FIRST_IN_LOGICAL_SWITCHES = -SWSRC_LAST_IN_LOGICAL_SWITCHES,
+  SWSRC_FIRST_IN_MIXES = -SWSRC_LAST_IN_MIXES,
 };
 
 enum MixSources {
@@ -1610,12 +1617,14 @@ enum TimerModes {
   TMRMODE_THR,
   TMRMODE_THR_REL,
   TMRMODE_THR_TRG,
-  TMRMODE_FIRST_SWITCH
+  TMRMODE_COUNT
 };
 
-#define COUNTDOWN_SILENT 0
-#define COUNTDOWN_BEEPS  1
-#define COUNTDOWN_VOICE  2
+enum CountDownModes {
+  COUNTDOWN_SILENT,
+  COUNTDOWN_BEEPS,
+  COUNTDOWN_VOICE
+};
 
 #if defined(CPUARM) || defined(CPUM2560)
 PACK(typedef struct t_TimerData {
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 7e8c940e5..0e14cfede 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -2322,7 +2322,7 @@ void doMixerCalculations()
             }
           }
           else {
-            if (tm > 0) tm -= (TMR_VAROFS-1);
+            if (tm > 0) tm -= (TMRMODE_COUNT-1);
             if (getSwitch(tm))
               newTimerVal++;
           }
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index a3ce6fd2a..b79ab81ff 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -1085,8 +1085,6 @@ extern int16_t calcRESXto1000(int16_t x);
 extern int8_t  calcRESXto100(int16_t x);
 #endif
 
-#define TMR_VAROFS  5
-
 extern const char vers_stamp[];
 
 extern uint8_t            g_vbat100mV;