I assumed that as you mentioned "matched servos" no "trimming" would be needed.
If I add the option of two more aileron channels controlled by the stab, it seems to me any "trimming" would need to be added in the receiver if the servo response is to be the same for both control inputs and stab inputs, a bit like adding a curve on the Tx but putting this in the Rx.
Mike
Yes, I mean matched, but channel matched on the radio, not into programmable servos.
Like we do in RB25S or RB35S boxes. Exactly like elevators.
In this case, we do the fine triming in the TX.
We match center, then highest and lowest levels. That's all.
Since 2 or 3 months, we can easily trim with curves on Ethos radio but I'm not sure stab function respect those curves.
Before that, only 3 points were ok so, no complex curves have to be added in RX.
Then, you only have to add 2 more aileron channels controlled by the stab without hard mods. You already did it for elevators.
( For the rudder case, I don't think people fly so big models without box, so a 2nd rudder chan should be useless )
Happy new year and sorry for my bad English language, it's not my native one.