It's a bit hard to do at first, but you really are supposed to ride a stock horse more with your seat and your legs than your hands. This is because when you are working cattle (which is what the horse is bred to do), you need your hands for other things. In the beginning you use your hands as a reinforcement but you first ask for gait changes and direction changes with your legs and seat, give him a heartbeat to comply, and then only reinforce with your hand. Eventually you won't need your hands at all. Ever seen Lynn Palm ride bridle-less? This is the basis of how that works. To control speed, you push with your seat for more speed and you lighten your seat to slow down. It sometimes takes a bit for him to learn the cues, but if you are consistent, he WILL learn them.
HTH
Rusty
HTH
Rusty