The menu button for sabayon in its current state (3.25c) is VERY annoying. Firstly the button itself should be clickable (or at least there should be an option to have it that way). Secondly the tabs inside the menu should only change when the mouse is paused over them for, say 2 seconds (or maybe 1.5 secs) and not instantly. Alternatively the user could also click on the tab to open it instantly. Thirdly, the menu should appear when you release the windows-key/super-key (after pressing it of course) and not as soon as you press it. This way the key would still be usable for beryl shortcuts like toggling window negative (and when shortcuts are initiated using key combinations, the menu shouldn't open).
I hope these suggestions are taken in to consideration