I was thinking, when you play a match in multiplayer your team is a certain colour and they (if left to default) have markers above their head, well why not just get rid of the team colour and just have the green marker, that way you can tell your team apart from enemies and you get to play in your prefered colour. It wouldn't make a massive difference.
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That would be cool but there are alot of idiots out there and they would kill their own team mates.