Clean up and implement MT release w/o mod press.

boards/native_posix.overlay

@@ -13,7 +13,8 @@
 
 		rows = <2>;
 		columns = <2>;
-		events = <ZMK_MOCK_PRESS(0,0,800) ZMK_MOCK_RELEASE(0,0,800)>;
+		events = <ZMK_MOCK_PRESS(0,1,300) ZMK_MOCK_PRESS(0,0,300) ZMK_MOCK_RELEASE(0,0,300) ZMK_MOCK_RELEASE(0,1,300)>;
+		// events = <ZMK_MOCK_PRESS(0,0,800) ZMK_MOCK_RELEASE(0,0,800) ZMK_MOCK_PRESS(0,1,800) ZMK_MOCK_RELEASE(0,1,800)>;
 	};
 
 	keymap0: keymap {
@@ -29,7 +30,7 @@
 			label = "DEFAULT";
 			keys =
 	<
-	KC_A KC_B
+	KC_A MT(MOD_LSFT, KC_B)
 	KC_C KC_D
 	>;
 		};

include/dt-bindings/zmk/keys.h

@@ -86,6 +86,7 @@
 #define ZK_ACTION(k) (k >> 24)
 #define _ACTION(a) (a << 24)
 #define _ACTION_MODS(m) (m << 16)
+#define ZK_KEY(a) (a & 0xFFFF)
 #define ZK_MODS(a) ((a >> 16) & 0xFF)
 
 #define ZMK_ACTION_KEY 0x01

src/endpoints.c

@@ -56,9 +56,6 @@ int zmk_endpoints_send_report()
 
 int zmk_endpoints_send_key_event(struct zmk_key_event key_event)
 {
-    struct zmk_hid_report *report;
-    int err;
-
     LOG_DBG("key %d, state %d\n", key_event.key, key_event.pressed);
 
     if (key_event.pressed)

src/handlers.c

@@ -32,8 +32,16 @@ bool zmk_handle_action(zmk_action action, struct zmk_key_event *key_event)
 			zmk_hid_unregister_mods(mods);
 			if (action_effect_pending & BIT(flattened_index))
 			{
-				// Allow baseline keycode to flow to the endpoints!
-				return true;
+				struct zmk_key_event non_mod_event =
+					{
+						.row = key_event->row,
+						.column = key_event->column,
+						.key = ZK_KEY(key_event->key),
+						.pressed = true};
+
+				zmk_handle_key(non_mod_event);
+				non_mod_event.pressed = false;
+				zmk_handle_key(non_mod_event);
 			}
 			else
 			{