[P/O W. 'Moggy' Cattermole]

Ok, so every aeroplane i've flown on this i can trim the elevators and rudders so that the plane can more or less fly level. However, not every aircraft can trim its ailerons, especially fighters. As such, i cannot trim these aircraft to fly perfectly straight. It isn't a big deal, i managed for ages to fly without trimming anything, but is this my own stupidity, or is it that certain aircraft couldn't trim ailerons?