You should get half the score (or experience) from killing members of your fireteam.
English
-
But the only problem is that then people who go in with friends to legitimately have a good time and play by the rules get punished. I think OP's original idea of no fireteams is the best option
-
Or better yet, a negative score when too many kills of your own fire team start racking up.
-
Seconded.
-
That actually sounds pretty good. That I could accept.