diff --git a/companion/src/modeledit/node.h b/companion/src/modeledit/node.h
index 896ffc088..facb44ca6 100644
--- a/companion/src/modeledit/node.h
+++ b/companion/src/modeledit/node.h
@@ -57,6 +57,8 @@ class Node : public QGraphicsObject
 
     void setCenteringX(bool val) { centerX = val; }
     void setCenteringY(bool val) { centerY = val; }
+    bool getCenteringX() const { return centerX; }
+    bool getCenteringY() const { return centerY; }
     void setFixedX(bool val) { fixedX = val; }
     void setFixedY(bool val) { fixedY = val; }
     bool getFixedX() { return fixedX; }
diff --git a/companion/src/simulation/wasmsimulatorinterface.cpp b/companion/src/simulation/wasmsimulatorinterface.cpp
index 6f76aa824..d9081741e 100644
--- a/companion/src/simulation/wasmsimulatorinterface.cpp
+++ b/companion/src/simulation/wasmsimulatorinterface.cpp
@@ -331,6 +331,8 @@ bool WasmSimulatorInterface::resolveExports()
   m_fnSetKey = wasm_runtime_lookup_function(m_moduleInst, "simuSetKey");
   m_fnSetTrim = wasm_runtime_lookup_function(m_moduleInst, "simuSetTrim");
   m_fnSetSwitch = wasm_runtime_lookup_function(m_moduleInst, "simuSetSwitch");
+  m_fnSetTxVoltage =
+      wasm_runtime_lookup_function(m_moduleInst, "simuSetTxVoltage");
   m_fnLcdChanged =
       wasm_runtime_lookup_function(m_moduleInst, "simuLcdChanged");
   m_fnLcdCopy = wasm_runtime_lookup_function(m_moduleInst, "simuLcdCopy");
@@ -441,10 +443,10 @@ void WasmSimulatorInterface::init()
   }
 
   m_stopRequested = false;
-  memset(m_analogValues, 0, sizeof(m_analogValues));
 
   // Call simuInit
   QMutexLocker lckr(&m_mutex);
+  memset(m_analogValues, 0, sizeof(m_analogValues));
   wasm_runtime_call_wasm(m_execEnv, m_fnInit, 0, nullptr);
 
   // Query LCD dimensions
@@ -612,12 +614,14 @@ void WasmSimulatorInterface::setVolumeGain(const int value)
 
 void WasmSimulatorInterface::setAnalogValue(uint8_t index, int16_t value)
 {
+  QMutexLocker lckr(&m_mutex);
   if (index < MAX_ANALOGS)
     m_analogValues[index] = value;
 }
 
 int16_t WasmSimulatorInterface::getAnalogValue(uint8_t index)
 {
+  QMutexLocker lckr(&m_mutex);
   if (index < MAX_ANALOGS)
     return m_analogValues[index];
   return 0;
@@ -641,6 +645,15 @@ void WasmSimulatorInterface::setSwitch(uint8_t swtch, int8_t state)
   wasm_runtime_call_wasm(m_execEnv, m_fnSetSwitch, 2, argv);
 }
 
+void WasmSimulatorInterface::setTxVoltage(int32_t decivolts)
+{
+  if (!m_fnSetTxVoltage || !m_execEnv)
+    return;
+  QMutexLocker lckr(&m_mutex);
+  uint32_t argv[1] = {(uint32_t)decivolts};
+  wasm_runtime_call_wasm(m_execEnv, m_fnSetTxVoltage, 1, argv);
+}
+
 void WasmSimulatorInterface::setTrim(unsigned int idx, int value)
 {
   if (!m_fnSetTrimValue || !m_execEnv)
@@ -679,7 +692,9 @@ void WasmSimulatorInterface::setInputValue(int type, uint8_t index,
       setAnalogValue(index, value);
       break;
     case INPUT_SRC_TXVIN:
-      setAnalogValue(index, value);
+      // Routed via a dedicated WASM export, not setAnalogValue(): index here
+      // is always 0, which would collide with STICK_AXIS_LH.
+      setTxVoltage(value);
       emit txBatteryVoltageChanged((unsigned int)value);
       break;
     case INPUT_SRC_SWITCH:
diff --git a/companion/src/simulation/wasmsimulatorinterface.h b/companion/src/simulation/wasmsimulatorinterface.h
index 84deaffb3..6daebe891 100644
--- a/companion/src/simulation/wasmsimulatorinterface.h
+++ b/companion/src/simulation/wasmsimulatorinterface.h
@@ -56,6 +56,7 @@ class WasmSimulatorInterface : public SimulatorInterface
     void setSwitch(uint8_t swtch, int8_t state) override;
     void setTrim(unsigned int idx, int value) override;
     void setTrimSwitch(uint8_t trim, bool state) override;
+    void setTxVoltage(int32_t decivolts);
     void setTrainerInput(unsigned int inputNumber, int16_t value) override;
     void setInputValue(int type, uint8_t index, int16_t value) override;
     void rotaryEncoderEvent(int steps) override;
@@ -157,6 +158,7 @@ class WasmSimulatorInterface : public SimulatorInterface
     wasm_function_inst_t m_fnSetKey = nullptr;
     wasm_function_inst_t m_fnSetTrim = nullptr;
     wasm_function_inst_t m_fnSetSwitch = nullptr;
+    wasm_function_inst_t m_fnSetTxVoltage = nullptr;
     wasm_function_inst_t m_fnLcdChanged = nullptr;
     wasm_function_inst_t m_fnLcdCopy = nullptr;
     wasm_function_inst_t m_fnLcdGetWidth = nullptr;
diff --git a/companion/src/simulation/widgets/virtualjoystickwidget.cpp b/companion/src/simulation/widgets/virtualjoystickwidget.cpp
index bd53b1de5..6902ca81a 100644
--- a/companion/src/simulation/widgets/virtualjoystickwidget.cpp
+++ b/companion/src/simulation/widgets/virtualjoystickwidget.cpp
@@ -419,8 +419,12 @@ void VirtualJoystickWidget::setSize(const QSize & size, const QSize &)
   qreal h  = qr.height() - ballSize;
   qreal cx = qr.width() / 2;
   qreal cy = qr.height() / 2;
-  qreal nodeX = node->getX();
-  qreal nodeY = node->getY();
+  // Self-centering axes always resolve to 0 after a resize instead of
+  // reapplying a captured value, which can be garbage from a transient
+  // scene rect during construction/layout and would otherwise get
+  // permanently re-latched on every subsequent resize.
+  qreal nodeX = (node->getCenteringX() && !node->isPressed()) ? 0.0 : node->getX();
+  qreal nodeY = (node->getCenteringY() && !node->isPressed()) ? 0.0 : node->getY();
 
   scene->setSceneRect(-cx,-cy,w,h);
 
diff --git a/radio/src/targets/simu/adc_driver.cpp b/radio/src/targets/simu/adc_driver.cpp
index 94fa69b57..7ab04c035 100644
--- a/radio/src/targets/simu/adc_driver.cpp
+++ b/radio/src/targets/simu/adc_driver.cpp
@@ -51,6 +51,14 @@ uint16_t getRTCBatteryVoltage()
 
 extern uint16_t simuGetAnalog(uint8_t idx);
 
+// Negative = no override, fall back to the vBatWarn-derived default below.
+static int32_t s_simuTxVoltageOverride = -1;
+
+void simuSetTxVoltage(int32_t decivolts)
+{
+  s_simuTxVoltageOverride = decivolts;
+}
+
 static bool simu_start_conversion()
 {
   int max_input = adcGetMaxInputs(ADC_INPUT_ALL);
@@ -58,13 +66,18 @@ static bool simu_start_conversion()
     setAnalogValue(i, simuGetAnalog(i));
   }
 
-  // set batteries default voltages
   int i = adcGetInputOffset(ADC_INPUT_VBAT);
   if (i > 0) {
-    // +0.5V and prec2
-    uint16_t vBatWarn = BATTERY_WARN;
-    if (g_eeGeneral.vBatWarn > 0) vBatWarn = g_eeGeneral.vBatWarn;
-    uint16_t volts = (vBatWarn + 5) * 10;
+    uint16_t vBatDeciVolts;
+    if (s_simuTxVoltageOverride >= 0) {
+      vBatDeciVolts = (uint16_t)s_simuTxVoltageOverride;
+    } else {
+      // set battery default voltage: +0.5V above the warning threshold
+      uint16_t vBatWarn = BATTERY_WARN;
+      if (g_eeGeneral.vBatWarn > 0) vBatWarn = g_eeGeneral.vBatWarn;
+      vBatDeciVolts = vBatWarn + 5;
+    }
+    uint16_t volts = vBatDeciVolts * 10; // prec2
     setAnalogValue(i, volts * 2);
   }
 
diff --git a/radio/src/targets/simu/simulib.h b/radio/src/targets/simu/simulib.h
index 905364150..5e22edf86 100644
--- a/radio/src/targets/simu/simulib.h
+++ b/radio/src/targets/simu/simulib.h
@@ -60,6 +60,10 @@ void WASM_EXPORT(simuSetKey)(uint8_t key, bool state);
 void WASM_EXPORT(simuSetTrim)(uint8_t trim, bool state);
 void WASM_EXPORT(simuSetSwitch)(uint8_t swtch, int8_t state);
 
+// TX battery voltage override, in decivolts (85 = 8.5V). Pass a negative
+// value to clear the override and go back to the vBatWarn-derived default.
+void WASM_EXPORT(simuSetTxVoltage)(int32_t decivolts);
+
 // Touch: call simuTouchDown(x,y) on press and repeatedly during drag
 // (continuous position updates), then simuTouchUp() on release.
 // The firmware detects slides from successive position changes.
diff --git a/tools/build-common.sh b/tools/build-common.sh
index 7dbe0d2d6..4122bd8e4 100644
--- a/tools/build-common.sh
+++ b/tools/build-common.sh
@@ -182,7 +182,9 @@ get_target_build_options() {
 
 # Determine parallel job limit based on environment
 determine_max_jobs() {
-  if [[ -n ${CMAKE_BUILD_PARALLEL_LEVEL} ]]; then
+  if [[ -n ${MAX_JOBS} ]]; then
+    : # explicit caller override, keep as-is
+  elif [[ -n ${CMAKE_BUILD_PARALLEL_LEVEL} ]]; then
     MAX_JOBS=${CMAKE_BUILD_PARALLEL_LEVEL}
   elif [ -n "$GITHUB_ACTIONS" ]; then
     # Limit jobs in GitHub Actions to n-1 to avoid resource contention
diff --git a/tools/build-wasm-modules.sh b/tools/build-wasm-modules.sh
index 7037267db..31ef0b32a 100755
--- a/tools/build-wasm-modules.sh
+++ b/tools/build-wasm-modules.sh
@@ -47,9 +47,7 @@ if [[ -z ${EDGETX_VERSION_SUFFIX} ]]; then
   fi
 fi
 
-if [[ -n "$GITHUB_ACTIONS" ]]; then
-  MAX_JOBS=${MAX_JOBS:-3}
-fi
+determine_max_jobs
 
 BUILD_DIR="build/wasm"