In every part of the game where I've had to use a vehicle with a mounted gun or the mounted gun itself (HMG turrets in bunkers and such excluded), my mouse sensitivity drops way down, causing turret rotation to be really sluggish.

Has anyone run into this?

Design flaw. I get the same issue. I'd like to be able to adjust sensitivity too.

Purposeful bump. I'm hoping I'm not the only person with this problem and that there's a fix for it. Turning mouse smoothing and mouse acceleration off didn't help, nor did changing sensitivity while in a vehicle.

I have to switch to my xbox gamepad to use vehicle mounted weapon. My mouse bocome very slow for it.