Well, TPA is the only game I've come across where you have to enable iCade support in a menu, so you shouldn't feel stupid for asking the question.
Stuart, you rock.
This is probably going to sound like a weird request (and it's probably completely pointless) but would there be any chance of maybe using a second device as a controller? I just had this weird thought, that playing on an iPad but using a 4S or 5 to control it could work really well, especially if you can use the gyro on the phone to tilt, but not have to move the entire iPad around.
It's probably stupid, but I'm putting it out there just in case