There is also the option to disallow a map to be voted if it was played 2 or 3 matches ago. The map name is semi-transparent in the list and you can see how many matches it will take til you can vote that map again. Sounds like an efficient measure against the suspense-only fans on map-vote servers.
I like this idea!
Is this an extra mod?
It would be nice if the current map cannot be the voted as next or after the next map.
That's the worst thing in my opinion to play a map twice.
No, its not an extra mutator, there is an option since patch 2.0, that allows us to force players not to be able to vote certain maps until atleast X ammount of games have passed since it was last played.