Depends what your trying to do.I left mine at AUX2 and AUX2 and use the Aux switch on the right front face to turn on and off the Align Gov.
Now there is a way to use the 3 pre mixes to set 3 different rpm's on the head. One for normal, one for idleup 1 and one for idleup 2. It was just posted on RR, I saw it the other day so I printed it out to save it for future use.
I've been generally running one fixed rpm as I only use one idleup rpm setting and my pitch curves are the same in all my flight modes anyways. If I want a slower rpm I turn it off and use a normal throttle mode curve.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!