BTW, I like your idea of putting the throttle servos on different channels so you can practice engine-out scenarios. The great thing about that method (as opposed to shorting one tank) is that you can run the second engine back up if you get in a real jam. Better than losing a plane...

How would you suggest doing the radio setup? Mix the two throttle channels and use a toggle switch to transfer control of the second throttle to one of the knobs on the radio? (I have a Futaba 9C.)