The only analog control Freelancer recognises is the mouse (the reticule). So, really, you cant control turnin with the joystick in analog mode. The turning controls are digital inputs (keyboard-gamepad). Only mouse-flight turns controlling to analog, and then you cant aim your weapons independently. I kinda like it this way, since it's already unrealistic that your main guns "revolute".
The reason I was setting mine up was to try and find a way to turn a ship in turret mode using a secondary controller. Just doesn't work. I was just using key mapping like everyone else here. A cool side was if you can get it to work better with the retical it is easier to setup joystick buttons to fire and strafe then it is a keyboard.
Look for a program called "Xpadder". It can mimic the mouse movements when using a joystick. I only got the basics down before Life kicked me in the teeth.
Formerly known as LPI Police Chief Hull O'Brien.
Creator of Sgt. V. Price, 207th Precinct out of Chula Vista Station