I have put the 2nd aileron on a separate channel so that I can have differential (defiantly makes my plane fly better). It was working fine with the APM not connected. I have set it up with the wiki brief.
What happens with mine is, all though both ailerons work correctly in all modes, differential will limit the roll in one direction, eg full left roll (both ailerons), half right roll (both ailerons). I cant see any other way to set it up.
Just discovered another disadvantage of having 2 aileron channels. If the APM resets (dont know why it should) then most of the controls are available in manual after about 3sec but the 2nd aileron remains in its deflected state for about 12sec.
I may just use a ‘Y’ lead UFN.