When flying helicopters there is a small lag in the cyclic input which makes helicopters extremely hard to fly, especially during hover. As a result of this you will constantly overcorrect. Also, the default helicopters should be more responsive to cyclic inputs. Hover should only require small, tiny inputs to the cyclic to make corrections. I was hoping SU12 would improve on the flight model for helicopters, but only fixes a few minor technical issues not related to flight dynamics.
Also, we really need a force trim function for helicopters. Flying without it is really miserable.