I've read spitfires came pre-trimmed as far as roll and elevator go, they were all test flown and if they rolled one way, they would bend the ailerons correspondingly with a tool abit like a tuning fork, them there were re tested and only when the tester ( I can't rember his name or which book I read these facts in) would release the plane for service.
Alot of BOB pilots used a touch of rudder trim either way so they didn't fly straight and were therefor harder to shoot down.
you can always center your bubble when shooting.
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