This is one of those things that will come up once in a while. Like one person put it. In the early days of proportional radios all brands I know of offered low end three channels. Rudder, engine, and elevator. Heck I owned one. Many trainers were three channel. Did it work? Yes that system worked great. The question is why would anyone want to go back. Jester is correct as far as I see it about over control of ailerons. A old buddy of mine seen me struggling with a student over controlling. He walks over and gets me to put in some expo. problem solved. That is this time.
There is all sorts of beginners. Some just starting out know a bit of something about flight. We, as us, the guys that have been around forget at times some people just don't understand basic flight control. There is many time some new folks don't have a clue. My son-in-law is just starting out. His first thoughts was the aircraft control was the rudder. Explaining how a ailerons work is a new experience. Add the ailerons and the elevator is still more confusing for some.
Bottom line. Use the ailerons and an instructor if you can find one. It will all be better in the long haul.