I see that a lot of people make all sorts of good/weird/horrible suggestions so here is my two cents.

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-1-
In-game Chat Log.

When I play, I often find myself too busy to read the onscreen chats. I would love to be able to bring back the last few chat-messages, for instance like the much used ~ key. Think CS/Battlefield Bad Company 2/Rainbow 6/Any FPS.

-2-
Team Votekick

Most of the time when we try to kick griefers, the opposing team doesn't really care. A griefer on the other team is perfect, he's some kind of under cover agent.

I would suggest that the votes needed to kick a player is based on the total players on the current team, not total players on the server. This would make it easier for a team to kick a same-team griefer.

Like;

Blue team 12 players
Green team, 8 player

Blue griefer needs 6+ votes.
Green griefer needs 4+ votes.

This could be team specific or server wide.
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Community or dev, any thoughts?

I like both suggestions.
A small correction: You need 25% of the players atm for a successful votekick not 50%.