I apologize if this is already implemented and my search skills are just sub-par, but for some drive types, the torque reaction is linear instead of rotational. For instance, a chain drive will attempt to pull the two sprockets together with a slight deviation toward the slack side. This type of drive does have some rotational reaction, but the vast majority of the force is going to be pulling the axle sprocket towards the driven one and vice versa. Again, if this is implemented and I just couldn't figure it out. I apologize for the unnecessary thread.
