Hello, TT,
Regarding the aileron trim on the IAR-80/81: the ailerons had ground adjustable trim tabs (the so called ”fixed trim tabs”). So, the pilot was unable to trim the ailerons in-flight, trimming only being possible while the aircraft was on the ground.
I have a hunch that the ailerons were trimmed from the factory, after a few flights made by each aircraft leaving the production line, in order to keep the plane steady at cruise speed. From Radu Brânzan's book, "the fixed trim tabs could be adjusted on the ground across a range of 12 mm, corresponding to -40 deg to +40 deg".
The same thing happened with the rudder, that also had a fixed trim tab. The only in-flight trimmable control surfaces were the elevators.
In this situation, the only thing that I see fit for historical accuracy is having a command for aileron trimming, but only when the aircraft is in the following situation: on ground-zero speed. If the game detects speed indication, then the aileron trim command is locked and the trim tabs remain in the position they were set before. But I don't know if such a command chain is even possible in IL-2.
However, you did a great job until now, so keep going
I'll personally help with any interpretation of tehnical data for the IAR.