I think this might be a handy idea... a special item that will basically act as a submenu, but will display the most recently used items (of the bar). The number of entries should be configurable. The items shown should also be preserved during sessions. I usually launch the same items all the time, so such a submenu might become very handy, don't you think? I don't think that it's too difficult to implement, so what are you waiting for?