Hi Ernie,

I always have rudder to elevator & rudder to aileron mixing turned on on my GP Extra 330L 1/3 scale.
From my understanding the adverse rudder pitching and rolling tendencies of most airplanes affect the airplane in any attitude, whether it be in a knife edge or up/downline, so on. So if your plane pitches to the belly in knife edge, it will more than likely do the same thing in an upline.

I don't see any reason that you should not mix these into the radio as this is easily done. I am all for learning to clean up the flying with the sticks, but it is just that much less you will have to worry about while flying if the radio automatically takes care of it for you.

Some people also mix a small amount of down elevator with low/idle throttle which helps with downlines.

I am speaking more from an IMAC perspective than 3D, as that is the type of flying that I do.

-- Kevod