Three mouse buttons where supported right from the start (March this year). It doesn't matter what kind of mouse it is -- to the USB it all looks the same. E.g. I'm using a wireless mouse & keyboard.
And for the wheel support: I do not know, if it works particularily with your mouse. But there is a lot more to connect to the USB anyway. And some time later this year, there will be the generic HID class to support all wheels and buttons etc. whatever the mouse/tablet/keyboard/magic carpet features.
