Oh, I would have been totally for the options of either having a generic replacement healer who is gameplay-wise a Quinn-clone, or transforming him into a Cyborg. Of course, both options would have halted story-progress with Quinn, but well. The fact that he isn't killable is simply character-breaking; for both LS and DS. Light side, because they were actually the best catch someone with a Sith as a boss can have, given how little they usually value their underlings. Dark side, because... well, you've not just failed a Sith, but BETRAYED him? Come on! To say the truth, I didn't quite play my Sith Lord how I wanted him to. Originally, I intended to create an empire-loyal, but still comparably forgiving and honorable fellow. Slightly light side-leaning, if you know what I mean. But because my Jedi Knight, whom I wanted to play as a sort of "renegade-jedi" gave me quite a stir (can't wear fancy relics, have problems keeping my DS-vendor boots etc.), I decided to go full light side with my SW, even though I had quite a bunch of decisions that were rather out of character (the fact that I had LS Jaesa with me most of the time helped me acting kinder than I actually wanted to). So basically after Dromund Kaas, I've been LS all the time, with two exceptions: I let the other Sith bodyguards kill that annoying noble on Alderaan (on of the very very few DS options that were actually cheering Vette up), and I killed Quinn. Did I say Quinn? Sorry, I meant force-choked him to near-death and then took him back on my ship, because I was railroaded to do so -.-