Start a hangout
I am sure you guys have probably already solved the issue of freeing up the players hands and still having movement input but here is my idea. So you take a thumbstick and have a U shaped mount on the back so you can clip it on your hand just above (below? what ever the not finger bit is) the base of your index finger facing out towards the thumb. This would allow the control you are getting from the wii nunchuk (I think thats what your using) but free up all the finger except the thumb and even that if you're not moving.