Sounds like a pain in the neck to me. Multi-part turrets are already confusing as it is.
If you do it the way Kazan suggested the turrets on existing ships would have recoil too. If you start making it so that you need a special model format only new ships will have the ability.
Also it's my impression that the Turret code is a little hacked together as it is (apparently it was problem with colision detection and turrets that prevented them from being able to put multi-parts on the sides of ships). Changing the way turrets work might cause similar problems with the turrets we do have.
