Voting the next map is a cool thing, but maybe make it "secure"(forcing another map after X-times), so that some bored people dont always vote for the same map.

(Votehacks or just bored kiddies)

But well, i would prefer a small window (like in TF2) for votes, where I can quickly vote via F1/F2 (etc), because a big window would be too disturbing.

Also, there should be a vote-open-limit (so that one guy does not spam vote-questions)