From what I gathered from M0 and MF, the feet pedals controls the movements of the vector vanes/ feet in fighter and gerwalk. And in battroid mode it probably controls forward and backward walking. The joysticks controls the wing flaps (MF Ep. 2 when Alto saves Ranka), with individual pressure sensitive buttons for the fingers. Turning in battroid mode probably uses eye tracking and motion sensors. Like the head will turn where ever you look at and the body will turn where ever you turn towards. Aiming of the gun pod and punching probably uses eye tracking.