Friendly Fire is a neccessary part of any decent FPS in my opinion, and I hate servers that turn that off. It adds to the realism of a game, you can't just spray gunfire at the enemy without taking into consideration that you may have friendlies in the line of fire. It adds more skill to the game IMO.

Sure it's annoying when you have idiots who TK on purpose, but when this occurs (and it is clear that they did this on purpose) just punish the muppets. I think it's daft to consider dumping a perfectly good game mechanic that adds to the realistic experience of a game just because of a small number of idiots out there.

Battlefield: StarCraft

I'm in ur base, rapin' your Corsairs

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I don't know. I think there should be TKing, but it DOES get annoyed.

One thing I would love to see:

Vehicle damage.

I believe Enemy Territory: Quake Wars has it, where a certain part of a vehicle will effect it's performance. It would've been perfect for BF: 1942 if you could damage a tank's tracks and go from there. Or knock out head lights or a turret so it can't shoot, etc.