Its tedious and can be improved through friendly custimization options. While the muscle movement isnt hard, mentally it starts to annoy you every time you enter a vehicle, breaking your natural expectations of being able to move your head. It greatly brakes the flow creating a moment of annoyance and frustration between entering a vehicle and driving off. I'd be happy if it was just added as an option in some .ini file at least.
When they added the enable Freelook option, i thought this will do it. But it completely disables double alt tap aswell, making it impossible to turn the mouse controls back on(last i recall). Aswell as its still the same for both transport types, air and ground.
--(easy?)Fix proposal--
If it was possible i propose that the computer stores the last known players decision for each vehicle type. For instance if i entered a ground vehicle and double tapped alt, the game remembers that for all ground vehicles from now on, until i double tap alt again to reenable mouse movement, and then it overrides the last known decision. And the same goes for helicopters and planes, only in separate options.
We would greatly apreciate it. So far the game is shaping up impressively, would be great if the little annoyances that add up to big ones would be ironed out aswell.