As far as the acceleration comparisons go, there was a nutter on WoP forums a few years ago who claimed that the ability of an aircraft to accelerate can be expressed and evaluated by something called Specific Excess Power (Ps). Furthermore, said person was audacious enough to claim that the information necessary to compare the acceleration performance of one airplane relative to another is contained within the IL- 2 Compare diagrams. I can't find the thread now, but never mind, it was long and boring anyway. However, I was able to find a document which explains Ps:
http://www.aviation.org.uk/docs/flig...-FTM108/c5.pdf
Regarding the trim characteristics of a certain airplane, this will have to do with stability and control. While contributing factors of the control surfaces can be modeled, the peculiarities of inception mechanisms (sticks, yokes, pedals, hydraulic augmentators, balance weights,... ) scarcely can be. Luckily, one can assign trim to axis and then use IL- 2 Joy proggie to adjust the response curve of the trimmer to one's liking
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