I learned to fly on a 3 channel glider. Throttle(electric motor), elevator, and rudder. Since I was teaching myself and had no help I put the rudder on the rudder channel. Didn't want to have to re-learn the control when I got a four channel plane. I have not yet met anyone who learned to fly this way. Have met several who learned on 2 or 3 channel gliders, but in those cases the rudder was always on the aileron channel. I too have saved more than one plane being able to fly with rudder alone.
I only have 2 planes without rudder, an Aerocat(foamie propjet), and a duct-fan A-4 Skyhawk. I find it very irritating to try to give a touch of rudder to line up an approach or make a turn and have no response. Using rudder is just ingrained too deeply into my flying.