Oh I dunno.. I mean if u can get used to a keyboard in each hand (which you can) it shouldn't be too hard to get used to using your feet..

As for just that system, however, I don't see me spending any money on it. Constantly having to dive under your table after kicking the buttons flying would be only nearly as embarrasing as the first time someone u know spots it there.. why make it red and yellow when it'll be under a bloody table?!...

Besides, other than turning and looting on ur 2nd computer, I doubt it'd be any good without a few years of training. Maybe for a game designed with foot-control in mind (flight simulators, perhaps?) but not WoW.