The dual repeater is much better when you deploy the turret. It's a PITA to use with the joystick though, but the huge aim assist helps a lot.
Pre 3.0, I remember taking a skimmer mission with a friend. He took the "same as mine", meaning same mission giver and same system (we had slightly different rewards), and as long as we both engaged the skimmer, it would count for the both of us. 500cr per kill instead of 1000. It could work in a base, but that would require great trigger discipline, which can be hard when you get pummeled by the turrets and other skimmers.