Hedgehawg:

You can do this fairly easily in RFG2. You need to make a copy of the plane in order to edit it as G2 will not let you edit the default models. When you edit the plane, you need to click on the edit radio button.

This brings up a screen that shows each control surface and which servo controls it when certain switches are set. You can use this to set up flaperons, mixing elevator with flaps etc.

Email me if you are having problems and I'll try to help.

Carl