If low gravity is ok to use (does it auto reset to normal gravity when a new map loads? Or another one of those maybe things?) We could put it up as part of the vote when a skip is asked. Usually we only skip if the score is too one-sided or if it's a bad finale for infected. Might be a good idea to add these as options when we make a skip vote, add in charger dodge-ball or gravity, along with skipping or no skip.
I'd also like to see more use of them custom maps. It's a shame they can't be added to the normal lineup of maps. Would have been nice to allow any missing game data to automatically download/install for those who don't have it.
I think ultimately the main way to get things fresh again would be to add major game modes, buyable items that take time and debugging to get right. It'd be cool if we could add scavenger or other mutations as an option, even if we treated it as a special occasion like VIP. Wish I knew more about the programming to be of real help with that, but I'd be happy to help test sometime!