XJet, It sounds like your dream 3D airplane is a Cub with a big engine! I'm not sure that would make me a better pilot. Why fly a dog if you don't need to? Every good pilot I know takes the time to properly trim (this includes mixing) their planes. For wings19, if it's an aerobatic 3D plane, leave them on! The mixing is there to make the plane fly like all the controls are totally independent of each other. When you are 3D'n you want the plane to do exactly what you tell it to do and not have to compensate for any inherent coupling. Outside of pattern planes, there is very few that don't require at least some mixing.