I was wondering .. why not make playable pirates? Why do I have to be an Empire? Why can not raid planets, ships (other pirate bases), kidnap pops (and ask for redemptions), destroying planets ... stealing research (difficult for the pirates have salaried researchers ... but if you want, you can put both methods) ... in short, create chaos, play a game ... just for the sake of making chaos ... nice to conquer and purify the species ... but it's slow and boring ... better develop their piratical empire of terror ... maybe develop your base in an unexplored region of the galaxy and from there attacks the planets / ships (the pirates are immune to close border). They would kind of "space Norse" XD