Is it CL only? Because Clojure is pretty convenient for game design when you tie in the LWJGL and friends...
EDIT: I asked; am waiting for a reply. Will post when (if) I get it.
2nd EDIT: It appears that they haven't decided. I'd go ahead and submit your idea.
But--they won't have to optimize for that. They can deal with the common cases.
http://www.sealiecomputing.com/newtglider/
I don't think pre-written games would be allowed though :)
But it's irrelevant in the grand scheme of things... The purpose of the thing is to motivate yourself to make a game; there are no winners or prizes or anything. So if you like, you can put your name on the list, and if your finished game is "disqualified" for being in the wrong language, you've still got your game, so you still win.