should be possible. If you look in the .py for the arena, and look on line 16, you should see:
Arenas.SuperArena.__init__(self, "Arenas/arenaname/arenagmf.gmf")
change that to:
randomnumber = random.randint(0,3)
if randomnumber == 0:
Arenas.SuperArena.__init__(self, "Arenas/arenaname/arenagmf1.gmf
elif randomnumer == 1:
Arenas.SuperArena.__init__(self, "Arenas/arenaname/arenagmf2.gmf
else
Arenas.SuperArena.__init__(self, "Arenas/arenaname/arenagmf3.gmf
Obviously, changing the filenames as needed.