Actually Vecotr is romanceable, you just need to make diplomatic and "helpful" choices when you have him out. I am darkside 3 and he thinks I am the bees knees (9275/10000). I put him away when it will be mission turn-ins I know will tick him off. Same with Kaliyo, put her away when I will be making non-snarky decisions. Thus far I have used Kaliyo the most, all the way up until SCORPIO. You just need to shift the way you work with her a bit and she works out pretty well (use of stuns, etc.).