Focus mode "mouse / sloppy" and auto-raise delay not respected

I use the Unity Tweak Tool under 13.04. I found two settings which do not seem to be respected (have no influence on the behavior of windows): Open Unity Tweak Tool -> Window Manager -> Additional -> Focus Behavior. Set "Focus mode:" to "Mouse" (or "Sloppy") and the "Auto-raise delay" to either small or large (to see that this setting is not respected). Now the focus follows the mouse/cursor, but the delay until the application under the cursor is activated is always the same, no matter what the "Auto-raise delay" is. Also, it does not matter whether "Auto-raise" is On or Off. In both cases, the application under the cursor is immediately activated which is quite annoying if you want to change the settings of an open application and thus want to move the cursor to the menu bar on the top border of the screen. If move the cursor over a different application, its corresponding menu is displayed in the menu bar, not the one you wanted to navigate to. That's typically why a delay feature is there, to make this step possible, but it's not working here.