If you mean like utilizing gyroscope and other sensor of the phone to control the game characters (like in Wii tennis, bowling and so on), I've thought about it but I don't think it's intuitive enough to use your phone like that and I think it would make the learning curve a bit too steep. Nintendo is great at what they do and it has taken a lot from them to make Wii-games work, I don't think it would be too useful to try to copy them :)