I like the idea of Game vendors. Maybe Game vendors on every planet, and the enemies could be like:
nar Shadda: Bounty hunter Fighters
Korriban: A trigger so you fight sith ghosts?
Dantooine: Mercenary Fighters
Telos: Normal Fighters
Am I forgetting anything?
Of course this would require reskinning the Turret module backround to fit with the enviourment, as well as creating new models. It would take time, I assume. Just an idea anyways, id do this myself if I didn't suck at new models and not doing much modding any more.