Well Hitech, some people won't shoot you, some will, some (most) will not steal a kill, some will. No way around it unfortunatly, I loved it with KS off in the CT, I was the first one to find out it was off when I got wacked by a friendly PT who fired at an enemy spit near me. Was very VERY fun after that and everybody knew to watch their fire.
Then again, maybe your right, proabrly are, those who steal kills (when they know he is dead) will allso kill a friendly to get a kill.