Simple system that slaves a bunch of turrets to the same control inputs for unidirectional aiming. All turrets will aim and fire in the same direction automatically, without having to place them as such, as long as the aimpoint is in their firing arc. Allows you to bring the maximum number of guns to bear on any target for multi-turreted aircraft. It should also be possible to do proper battleship aiming.

Activate1 - Activate/Zero turrets & guns
Activate7 - Activate forward guns only
Each turret also has its own camera and reticle

Pitch - Elevation
Roll - Traverse
Recommended to use mouse as joystick

See here for an example craft that implements this.

Please do not credit me. Feel free to save it as a subassembly, add/remove turrets and modify according to your own needs.