That is not a bug.

For your information: If you hold Ctrl (Strg for the German layout) and move your mouse, you move your head horizontaly to the left, right, front and back. It is for a better orientation, if you fly and want to check the area under and around the chopper.

You can only disable the function in the Arma3 config but not in the game.

Well, it is a bug of some sort then, if there is no way to disable it except going through the config itself.

Its not a bug when its intended. XD
May be get rid of this combination. Maybe use the Windows key?
BTW this feature is really needed because it guves you the possibility to look under your helicopter!!! Even in first person view.

Whether this feature is needed or not, should be a descision of the player. I've never used it.
I changed the ticket now in order to request a control entry to disable this feature.

No, it is not a bug, it is intended. But unfortunately not all key settings are available in the ingame settings.

If you want to disable the head movement, go to:

-libraries\documents\Arma3\username.Arma3Profile and open it with f.e. Notepad++
-press Ctrl+F and type: "keyFreeHeadMove"
-find and delete the number between those braces -> {}
-save the file

Now you can play your game and don't get annoyed by the head movement anymore (freelook still works)

related to #0021059