i think the best use of gravity can be with the consent of the players. after all, it's them playing, and they outnumber me. having admin is only fun if their experience in the server is better, or at least not worse, because of me or other admins.
if we want to be strict and to the point about it, no, we don't need the means to set gravity. obviously, evil went a little overboard, lol...and restricting to upper level and clan could also work.
but as i said earlier, we successfully used it in gungame without problems, and when players protested, I immediately restored the normal level. used in that fashion, i think it's cool and can be useful for fun servers. out of hand, like some people (lol evil) it gets crazy. hehe.
whatever you like zero. heh.