Tailrotor: is not responsive enough for both joystick and default X and C keys.
When in hover the turning goes to slow and at full speed nothing happens and I am sure the tailrotor is supposed to be of more influence.
Tail fin: does nothing at all/not enough. For example: if you keep the nose of the chopper directly to the north you can go any direction without the chopper swinging arround by the air hitting the fin, unless you reach quite high velocity.
Could reach 200kmph going backwards and when you do swing arround its not violent at all (like the wind is hitting the fin with 200kmph)