When aircrafts turn to the left and right, they roll (pitch, yaw, roll) themselves as they turn. A fun feature would be implementing a configurable level of screen roll as the player turns.

To answer both request #1 and this one: those are good ideas, I've seen the mod Icarus doing this with their wings. I will keep them in mind. I still have to figure out exactly how to do this, but I'll add it to the todo-list.

Limitless pitch would be cool to make loops when flying.

@ShaneTRS check out the Do a Barrel Roll mod :)