The devs are currently so busy making/fixing/tweaking the game that they have little time to write or maintain a manual describing it.

Luckily, there's the awesome power of the VO community:

http://www.vo-wiki.com/wiki/index.php?title=Binds

I'm all for having the turret selection as the capship model and all the turrets, click the turret, you're in. Problem solved :)