I’m using an Adesso WKB-4000US that works fine with a MacBookPro. Using ATVFlash 4.0.3, all that worked was scrolling up/down (with the right side of the track pad), and the pad keys (left to select, right to back up the menu). The keyboard would not enter text and I could find no way to scroll left/right or to move the mouse (other than up/down using the right side of the key pad).
After installing 4.0.4, I can now enter text, eg in URLs in Couch Surfer.
I still haven’t figured out how to scroll in general or even just left/right.
(As an aside, I don’t know if Flash is supposed to be fixed with 4.0.4, but I haven’t been successful in getting it to work. I did ‘Install’ it as a plug-in and I did turn on web plug-ins in Couch Surfer’s settings).