I like everybody's input in this thread. Like Wayne said, the airplane doesn't know what attitude it is in so if a little elevator and opposite aileron is needed to counteract pitching and adverse roll when the rudder is slammed, add it with a programmable mix.
Billy, your 8U is fully capable. That is the transmitter I am using at this time. On my UltraStick 60 I have all 5 Pmixes in operation in one way or another.
Don Edberg's Book, Programming Futaba's 8U is great, I got mine from Don at
http://www.flash.net/~dynamic3/don.html
Tom...