RE: Gas RC was a mistake !!!!
I learned to fly on a plane with no rudder, and am flying a Nitro solo without any instruction from anybody else. Im 14, and have taught myself to fly with rudder on a 4 channel, but didnt fly with it untill i was ready. It is definitely not bad to wait untill you can fly without crashing to use it.
I also do see your point about having them taxi, though. That was what I did first. I just didnt fly with rudder for a while. I take off and land by myself.