diff --git a/source/buttons.cpp b/source/buttons.cpp
index 0b40a68..60e97a5 100644
--- a/source/buttons.cpp
+++ b/source/buttons.cpp
@@ -4,12 +4,19 @@
 #include <bluefruit.h>
 
 extern BLEHidAdafruit blehid;
+extern Config cfg;
 
 static uint8_t physBtnMask = 0;
 static uint8_t rawMaskPrev = 0;
 static unsigned long debounceMs = 0;
 static const unsigned long DEBOUNCE_MS = 20;
 
+// Double-press detection for left button
+static const unsigned long DOUBLE_PRESS_MS = 400;   // max gap between two releases
+static const unsigned long KEY_HOLD_MS     = 60;    // how long to hold the key down
+static unsigned long lastLeftReleaseMs = 0;
+static unsigned long keyDownUntil      = 0;
+
 // Setup 
 void setupPhysicalButtons() {
   // Release any held physical buttons before reconfiguring
@@ -39,23 +46,48 @@ void setupPhysicalButtons() {
 void processPhysicalButtons() {
   if (!Bluefruit.connected()) return;
 
+  unsigned long now = millis();
+
+  // Release held key combo after KEY_HOLD_MS
+  if (keyDownUntil && now >= keyDownUntil) {
+    uint8_t noKeys[6] = {};
+    blehid.keyboardReport(0, noKeys);
+    keyDownUntil = 0;
+    Serial.println("[BTN] key release");
+  }
+
   uint8_t rawMask = 0;
   if (BTN_LEFT_PIN   != BTN_PIN_NONE && digitalRead(BTN_LEFT_PIN)   == LOW) rawMask |= MOUSE_BUTTON_LEFT;
   if (BTN_RIGHT_PIN  != BTN_PIN_NONE && digitalRead(BTN_RIGHT_PIN)  == LOW) rawMask |= MOUSE_BUTTON_RIGHT;
   if (BTN_MIDDLE_PIN != BTN_PIN_NONE && digitalRead(BTN_MIDDLE_PIN) == LOW) rawMask |= MOUSE_BUTTON_MIDDLE;
 
-  if (rawMask != rawMaskPrev) { rawMaskPrev = rawMask; debounceMs = millis(); }
-  if (rawMask != physBtnMask && (millis() - debounceMs >= DEBOUNCE_MS)) {
+  if (rawMask != rawMaskPrev) { rawMaskPrev = rawMask; debounceMs = now; }
+  if (rawMask != physBtnMask && (now - debounceMs >= DEBOUNCE_MS)) {
     uint8_t newMask = rawMask;
-    uint8_t pressed  = newMask & ~physBtnMask;   // bits that just went down
-    uint8_t released = physBtnMask & ~newMask;    // bits that just went up
+    uint8_t pressed  = newMask & ~physBtnMask;
+    uint8_t released = physBtnMask & ~newMask;
     physBtnMask = newMask;
     if (physBtnMask) blehid.mouseButtonPress(physBtnMask);
     else             blehid.mouseButtonRelease();
     if (pressed & MOUSE_BUTTON_LEFT)    Serial.println("[BTN] L press");
     if (pressed & MOUSE_BUTTON_RIGHT)   Serial.println("[BTN] R press");
     if (pressed & MOUSE_BUTTON_MIDDLE)  Serial.println("[BTN] M press");
-    if (released & MOUSE_BUTTON_LEFT)   Serial.println("[BTN] L release");
+    if (released & MOUSE_BUTTON_LEFT) {
+      unsigned long gap = lastLeftReleaseMs ? (now - lastLeftReleaseMs) : 0;
+      Serial.print("[BTN] L release - gap="); Serial.print(gap);
+      Serial.print("ms (max="); Serial.print(DOUBLE_PRESS_MS); Serial.println("ms)");
+      // Double-press detection: two short presses → fire key combo
+      if (lastLeftReleaseMs && (gap <= DOUBLE_PRESS_MS)) {
+        uint8_t keys[6] = {cfg.tapKey, 0, 0, 0, 0, 0};
+        blehid.keyboardReport(cfg.tapMod, keys);
+        keyDownUntil = now + KEY_HOLD_MS;
+        lastLeftReleaseMs = 0;
+        Serial.print("[BTN] Double-press → key 0x"); Serial.print(cfg.tapKey, HEX);
+        Serial.print(" mod 0x"); Serial.println(cfg.tapMod, HEX);
+      } else {
+        lastLeftReleaseMs = now;
+      }
+    }
     if (released & MOUSE_BUTTON_RIGHT)  Serial.println("[BTN] R release");
     if (released & MOUSE_BUTTON_MIDDLE) Serial.println("[BTN] M release");
   }
diff --git a/source/main.cpp b/source/main.cpp
index aff668e..fcb857a 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -45,7 +45,7 @@ File cfgFile(InternalFS);
 Config cfg;
 const Config CFG_DEFAULTS = {
   CONFIG_MAGIC, 600.0f, 0.060f, 0.08f, CURVE_LINEAR, 0x00, CHARGE_SLOW,
-  /*tapThreshold=*/12, /*tapAction=*/TAP_ACTION_LEFT, /*tapKey=*/0, /*tapMod=*/0,
+  /*tapThreshold=*/12, /*tapAction=*/TAP_ACTION_KEY, /*tapKey=*/0x04, /*tapMod=*/0x03,  // Ctrl+Shift+A
   /*jerkThreshold=*/2000.0f, /*tapFreezeEnabled=*/1, /*featureFlags=*/FLAG_ALL_DEFAULT
 };