I am trying to improve my 3D flying and I wondered if anybody had any good guidelines/tricks/tips for learning rudder control while inverted?

I am flying a foamy during lunch (e-foamies Mini R3D) at work. It is capable of making nearly flat rudder turns without aileron correction.

Tricks like pointing the stick to the dropping wing for aileron corrections don't seem to exist for rudders.

I am always getting mixed up while inverted. The answer might be just to practice, practice, practice until the motor functions are automatic

Kris.