RCPilet, that is the same key that I use.. Dont let the cute remarks get to you. Everyone has something they are looking at to key them on different things. Once I figured that out it was a major epiphany for me too. That is when I really got cranked up on doing integrated rolling circles and loops and stuff. It works exactly like you describe. It does not matter what direction the airplane is traveling, left to right or right to left. If the canopy is facing you, you use the rudder to push the top wingtip back to lift the nose (as if your thumb was actually on the top wingtip), if the belly is facing you you push the bottom wingtip forward to lift the nose(as if your thumb was actually on the bottom wingtip). Its a great visual association to help get things going.

Here is another one. When the plane is inverted steer with the inboard wingtip(the one closest to you.) Just as in knife edge, when inverted you imagine your thumb is on the inboard wingtip and you move your rudder stick thumb the direction you want the wingtip to go. This is easiest to learn in a loop. Just start doing large controlled loops. Use the ailerons to maintain wings level (ONLY) use the rudder to maintain heading. As the plane passes 9/3 o clock and starts to enter inverted you steer the inboard wingtip. As it comes upright you just work the rudder normally.

As bdavidson said.. once you have done this enough the achieve muscle memory you will not even think about it anymore.. Working the rudder in any position becomes a seamless action that you do without thought.

I know a lot of people dont like visual keys,, but they have been VERY helpful in learning to have total control for sequence flying and freestyle stuff.