Throwing another idea into the mix.
I was wondering if there was a way to have the maplist adjust depending on how many players there were. So if there are only 4-6 players, then the "3v3-or-less" maps would appear on the map voting list. If there were 16 players, then the maps that can handle 16 players will appear on the map voting list.
Of course, this would be setup ahead of time by the server admin.
Perhaps multiple maplists?
Or perhaps someone out there with more technical knowledge of Nexuiz could come up with a better variation of this idea.