First try on the moving player part.
Our first solution: The ship look at the mouse position and you move the ship using "WASD". The ship move independently of where the ship is looking at.
Other solution: Do something like in Asteroid, you press "W", the ship go forward, and so follow the mouse position, and "A" and "D" are used to do strafe.
We will keep the first solution for the moment. It's take one minute to get into it, but we think it will be better with big ship and lots of turrels ...
To be reviewed later!