I think something like this would be good to have, but the problem is, how do we determine which maps make the list?
You wouldn't be required to match only on maps in the approved list, but if the map isn't on the list, both clans would need to agree on the map.
There are some obvious maps that won't make the cut, like the various Joe Newbie's Unvised Box of Autocockers and Transparent Bunkers, but some are not so obvious -- like the old "classic" maps that really aren't that great, but they've been with us forever.