Pugsley,
I set up programmable mixes for elevator and aileron with Rudder as the Master for straight point rolls at full throttle. I run low pitch props so full throttle isn't all that fast, especially in knife edge flight. I use full throttle so I'm always near a constant speed so that the mix is always pretty close to perfect. If I knife edge at a lower speed, or knife edge loop, I just leave the mix on and fly the rest of the coupling out of it.