Turrets should not self-repair. Enough said.

No, but I wouldn't mind a couple Orun collectors with repair beams being launched from the station to repair them periodically.

Whatever, as long as it's not frequent and they can be killed. If people want their turrets to repair, they should get repair guns and do it themselves.

Agreed, it's nice enough to have free turret defense in the first place so anything else should be paid by the player(s)