If memory serves (or IIRC), there was such a separate furball 'test' arena and I believe it was to address issues brought up by Hubs and some of the other BK types. Three separate 'zones' with at least two opposing fields were placed about 300+ miles apart where there was an early warbirds zone, a mid war warbirds zone, and a late war warbirds zone. The knight/bish/rook fields were much closer, sometimes right next to each other, within the early/mid/late plane 'zones'. It was popular for about a week then people stopped showing up.
I am not really sure what the problem(s) with that arean were, or if those types of arena's will always be sparcely populated. The 'furball' arena was gone with two weeks (maybe a month?). What I noticed was that most peoples tactics didn't change with vulching an enemy field as the only way they played the game. It was more like a weird AvA, imo.
Regards,
Malta
p.s. to 'explain' myself, the reason why hard high lethality field ack is needed is to force people to use ACM, or at least do something other than vulch. Vulching stops any furballing or multi-plane aerial combat when the fields are close. Then comes the 'they vulched us so we vulch them' mindset which also does not support furballing.