For the record, this is how to make the choppers control like Battlefield 2.
I think it should also be a usable preset. I think most people might fly easier with this setup so that more players can enjoy flying.
BF2 alike setup:
Cyclic Forward - mouse up
Cyclic Backward - mouse down
Bank Left - mouse left
Bank Right - mouse right
Yaw Left - A
Yaw Right - D
Collective Raise - W
Collective Lower - S
Also on the options when keybinding, there should be a visual description of what it does.
Like this for instance: Bank left/right shows a helicopter and arrows curving down from the sides.