Just to be clear, when you trim a real aircraft, you usually put it in the attitude you want and then trim until pressure is taken off the stick/pedals. That's what makes trimming a real aircraft easier than trimming a virtual aircraft.
As to how it is implemented on IL-2, I can't answer that. I have never fond FFB to work well in any sim and have given up on it until someone comes up with a good solution.
Splitter
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