My joystick is broken, so I have to use the mouse for now. It's not that bad, but there are some things that could be better.
Well, not everybody has a joystick anymore nowdays. This his why games like Freelancer improved their mouse controls.
Most basic thing: Support the wheel! My mouse doesn't have many buttons, so every single thing counts.
The wheel would be prefect for the throttle control.
No hard turns! That's the biggest problem imho. It's hard to turn. I can increase the sensitivity, but not without making it harder to aim.
This is just an idea, maybe there are other ways to fix this.
The cross is your mouse postion. You can't move it out of this ring. The closer you get the the edge of the ring, the faster the rotation in this direction will get. (exponential). In the the center part, the precision is very high, so the aiming will work perfectly.

I've no idea about the shape of this part of the code... I'm pretty sure my second suggestion will be problematic. But still consider it. It might just be the one missing bit to increase the userbase a lot.