Overstun is rarely a problem anymore, assuming your not inflicting large amount of hp dmg, almost everyone recovers 9% of current stun in addtions to recovery from health. So it pretty rare to lose someone you have only done stun to.
Yeah, I've noticed that stunning enemies is a lot more consistent, and they don't die all the time because one of my gals is too strong. The only issue sometimes is when they get back up and somebody reaction fires them even though they're harmless and will surrender once it's all said and done.
Cover I find is fleeting. Automatic doors are your friend. I "won" a lokk'narr rodeo by hiding in my aircar and having my dog check sky ninja positions until my one gal who can totally cut their heads off could dash out, get a kill, and hide again. Everybody died, but I got like 14 points and a bunch of swords. The ninja were standing out in the open and the pirates were striking from concealment.
Also cats are cool. Fantastic night vision, light up the targets with fire arrows, and fire away without retaliation.
Edit:
Query: Is the ghost icon on a unit an indication of overstun damage?