When you create a new game, would it be worth having two sections of maps to choose from, one for established, sorted maps; one for beta versions, where the basic idea is done, the xml coded but it just needs a bit of play-testing to make sure it's balanced and iron-out any errors.
Then if you want to try something new, you can, on the understanding that it isn't totally tweaked. And you'll know that if it's in development there'll be somewhere to offer feedback on it.
Phil