The HummingBird (and Pawnee) is supposed to be a light, responsive helicopter.
Since the beta, though, it's very slow and unresponsive, especially for roll inputs.
The CH-49 is now more responsive than the Humminbird, which is somewhat wrong.
Not asking for a fundamental change in the flight model in general here, just a revert for the Hummingbird.
Fly the Hummingbird, and compare to the Mohawk.
Watch this video: https://www.youtube.com/watch?v=-0DAOGLNI1c&feature=player_detailpage#t=36s
The rest of this video summarizes some of the other problems with the flight model in general.
Also, joystick input shouldn't be speed limited the way it is with the keyboard, and mouse input speed should depend on mouse speed.
Right now, the max responsiveness is that of the keyboard, which is way too slow, for all helicopters (a quick, full input to a side of the cyclic makes any helicopter respond very fast).