Serious question - Why do you want/need mouse buttons on your control panel?
Personally, I like to go for as few admin buttons as possible. That way, when people come over there's less that they can screw up.
Unless you're playing PC games on it, I'd try to eliminate the mouse buttons altogether. Once your cabinet is setup, if you set it up correctly, you should *almost* never have to touch Windows. In fact, if the cabinet is not networked, I would go as far as to say that you should never have to touch Windows.