"Keyboard shortcut" doesn't work the way I expect. I expect it to work like pressing a key -- pressing the button sends keydown, and releasing it sends keyup. This allows things like games to work properly, where an action is performed while the button is held, and stops when it's released.

I also expect the "Mission control" option to work the same way, so I can quickly view/switch windows -- when holding the button, releasing it leaves mission control, switching to the highlighted window.