Yup, those are already built in, thx for the reminder, Mike. I guess I delved into this specifically because of the Vegas user’s questions. Just a way to get things working kinda like Vegas for editors that may be switching from the brain-rotting-NLE. ;-)

If looking to zoom or other stuff, I’d use it in conjunction with another button - shift/command/control/something.

As far as I can tell, USB Overdrive won’t let you use a keyboard (or additional mousebutton) modifier with a command…but along those same lines, it would be just as easy to assign Click-Wheel-Up and Click-Wheel-Down to zoom. That would give you a quick zoom on the mousewheel, while still preserving the default FCP scrollwheel behavior. Hmm, I may go that route myself…