diff --git a/ui (gen4)/lib/keyboard.js b/ui (gen4)/lib/keyboard.js
index 8d64a9f6..edac68ca 100755
--- a/ui (gen4)/lib/keyboard.js	
+++ b/ui (gen4)/lib/keyboard.js	
@@ -246,6 +246,9 @@ function normalizeModifiers(c, a, s){
  * XXX check do we need did_handling here...
  * XXX BUG explicitly given modes do not yield results if the pattern 
  * 		does not match...
+ * XXX should action handler support event.stoppropagation()???
+ * 		...at this point I'm not sure it is needed as it will not affect 
+ * 		the keyboard handlers, it will preven further JS event handlers...
  */
 var getKeyHandlers =
 module.getKeyHandlers =
@@ -545,6 +548,8 @@ function getKeyHandlers(key, modifiers, keybindings, modes, shifted_keys, action
  *
  * NOTE: The handler will be called with keybindings as context (this).
  * NOTE: handlers found in actions will be called with the actions as context.
+ * NOTE: only for handlers found in actions, if the alias ends with '!'
+ * 		then event.preventDefault() will be called before the handler.
  * NOTE: adding a key to the ignore list has the same effect as returning
  * 		false form it's handler in the same context.
  * NOTE: actions,the last case, are used for alias referencing, they will
diff --git a/ui (gen4)/ui.js b/ui (gen4)/ui.js
index 1df142fd..6dd403af 100755
--- a/ui (gen4)/ui.js	
+++ b/ui (gen4)/ui.js	
@@ -90,10 +90,7 @@ module.GLOBAL_KEYBOARD = {
 			'ctrl+shift': 'F5',
 
 			// XXX testing...
-			ctrl: function(){ 
-				event.preventDefault()
-				a.reverseImages() 
-			},
+			ctrl: 'reverseImages!',
 		},
 		P: {
 			'ctrl+shift': 'F12',