Is there a way to make the head movement more sensitive? 
I mean: turning the head 20 degrees IRL translates into an almost 1:1 movement in game, which is fine, in theory, but due to the small FOV of the headsets, to see the wing out of the side windows in some planes, or look at the tail, you need to rotate your whole body, which is unnatural.

I'd suggest to never even suggest this kind of things! It is what Track IR must do, but for VR it is breaking the golden rule:

https://forums.flightsimulator.com/t/bug-feature-fs2020-is-breaking-the-vr-golden-rule-dont-move-the-camera-the-user-is/344861?u=cptlucky8

I had motion sickness for a week or so after getting the VR, now it's completely gone.
I asked if there's a way to set this, not to make it like this for everyone. Bsobo doesn't make changes based on what I write on AVS anyways.🙂