Modifyer keys for expose and fourth mouse button?


I am the law!
I just got a new mightymouse. I love the squeeze buttons on the side that activate expose. I wish there was a way to hold down a modifyer key and change the type of expose that is used, however.

I would like to set it up so that just squeezing the mouse would activate expose for all windows. Holding down option would activate it for the active application and holding down command would show the desktop.

Anybody have any ideas how this could be hacked to work?