Brakes are mandatory.

I don't understand the resistance to having yaw control on our airplanes. Just because the rest of the world doesn't have a rule doesn't mean they're correct. Having come from an aerobatics background, I couldn't imagine flying without all the primary flight controls functional. Having to build it yourself into an aircraft that didn't have it designed in the 1st place is a weak excuse for someone building a turbine model. You should be capable of building rudders into an airplane if you're going to build/fly turbine aircraft.