I think I have had this issue before. I don't seem to have access to AUX1 for the mix "in". Just AUX2. The AUX2 mix just does one of the right side toggles. So I can't get this to work as described, at least so far.
Originally Posted by freechip
Do you just want it as a second Aileron or it has to be flaperons.
All that would be required is to cancel the rudder stick by creating the proper Rudder > Rudder and using 100% values for rates and use +/- in the proper direction to cancel out the Rudder Stick.
Once that is done it's just a matter of mixing the AUX1 channel to the Rudder channel. Since AUX1 is the channel assigned to the Left aileron/Flaperon when you select the proper wing type.