On models -- where the servos are individual per aileron-- the servo has to hold aileron in position -against airloads .
Properly interconnected - a positive/negative G can NOT move the aileron --as one has to go up whilst the other goes down.
The full scale aerobats all use this arrangements --plus counterweights and spades .
So--- the pilot only has to provide desired inputs to ailerons and these are extremely light -being a two finger type force. (referring to EXTRA 300L).
early RC models tried torque rod hookups for ailerons - these were/are very bad. I am extremely familiar with the poor linkages used on some setups.
The first TOC model I built had these (against my advice not to) and one side promptly broke -
The model then got two servos (one each side ) as a fast patch up . (Contest was in a week)
The problem then was the poor center holding power of the 1970's servos. But it made it .
Using proper rod and bellcrank setup-the potential "windup" in individual aileron servos can be eliminated as the interconnection will for all practical purposes, prevent one aileron moving without moving the other a like amount in the opposite direction . The servo will tneed only enough force to start a roll. (similar to full scale practice.)
So -this is why I said the load is lessened on the control device.
Which it is .
Oh yes - the thick trailing edge -
really no big deal on the model except that the very thick edge does add rigidity and - as practiced on some aerobatic airfoils -- the very thick,blunt edge acts to create a very low pressure - which (theoretically) helps attach air on the ailerons .
I have no experience with building working on big aircraft -such as you apparantly are familiar with.
Just small stuff.