It's an odd concept, but Gamingmouse.com has a good point: if you can game with your hands, why not game with your feet? It works for pipe organs, after all. However, theory and practice don't always coincide - tap dancing on a pad to kill bad guys could certainly flop, but that's why we have reviews: like the one I4U did earlier today. As it turns out, the concept works pretty well, especially when used in the right situations: telling your character to go prone (instead of using the keyboard to do so), for example. You can read the full review here.