Just an idea for the free-for-all furballers:
It would work in the DA (with a dedicated area added to it) except for one part.
*Kill shooter is off
*Air starts
*Max. downwind set to start 5k under the air starts (this is what would conflict with the rest of the Duel Arena)
*Corridors as tight as the terrain editor will alow at cardinal points (N, S, W, E, and NE, NW, SE, SW too if possible) that channel into a square medium-large furball area.
I'd add the old clouds in which you can't see beyond point blank, just in case it's possible to fly up to the spawns despite the downwind, but that might get on some people's nerves. Players that don't know how to fly blind, or people that fly in the arena and it's airspawn shafts for the first time.
It's a pretty gamey setup, but it fits the audience and is the only way I see to keep vulchers away from the spawn points. 5 seconds of arcade flight and the rest of the sortie is non stop furballing like in the old, small free for all H2H maps, which frankly were never equaled in that regard.
It could work with less than all the anti-vulch features (e.g. just the air starts on a small enclosed arena), but that's just to brainstorm out loud.