I think a good ability for operatives would be a stealth kill, when behind an enemy it would be cool if operatives could silently kill them with a knife and then pull the body into the shadows leaving no trace of a kill or that the operative was even there.
though this would be "kinda" cool... it wouldnt be right to do it. Let alone how would you do it... simple, you wouldnt...
I see operatives eliminating stragglers alot, since theyre already detachable from the main group, and most likely will be, it would be kinda cool to use this then, cover you tracks n all... but for gameplay purposes i dont see this coming in.