The default controls on chopper are using non-realistic controls and movement, are apparently unintuitive and lead to uneffective flying and a lot of crashes to people trying choppers in the game for the first time. (on a side note, I've not seen ONE player keep the default chopper control scheme and be able to run a missin effective chopper role. Everyone changes the controls)
Controls in real choppers is done through 3 elements :
ArmA 3 controls should by default follow the same thing.
Cyclic is a 2 dimensions control, can be mimicked through mouse
Collective is a 1 dimension control, can be mimicked via 2 keyboard keys
Rudder is a 1 dimension control, can be mimicked via 2 keyboard keys.
This makes the flying experience natural and smooth.
The whole "Turn Left/Right" control is non existent in real choppers, and difficult to apprehend when trying to precisely control the chopper, namely for landing. If it has to remain, it should be an option and not the default control.