I have not given up my Slide-Arch E-Blue Keyboard it is $27. As it was OK in XP therefore I ran VISTA Upgrade advisor with that keyboard installed to see what VISTA will say. As I expected the keyboard is recognized as a KeyMaestro keyboard and it’s alright to be upgraded with it installed.
So I tried again. The trick is that if you have this keyboard plugged in VISTA just won’t accept it by default or give you any driver update even if you searched for it. You have to manually install the scroll wheel of the keyboard as a HID compliant mouse that it’ll be all OK. I didn’t have to use any KeyMaestro drivers but the hot keys are all working so I don’t care.