A 4 team map can be made perfectly symmetrical with teleporters or warpzones:
(Obviously would need two more teleporters for yellow/pink)
Or for the foolhardy:
http://forums.xonotic.org/showthread.php?tid=1599
Though come to think of it, I don't know if teleporters work with vehicles,
so this might only work for non-vehicle maps.
(Obviously would need two more teleporters for yellow/pink)
Or for the foolhardy:
http://forums.xonotic.org/showthread.php?tid=1599
Though come to think of it, I don't know if teleporters work with vehicles,
so this might only work for non-vehicle maps.