The game has been around for four years now, and no one has ever felt the need for symmetrical mazes. Personally, I don't think it's worth it; it wouldn't add anything to the game. A player had asked me the same thing for RandomPac, and I wanted to accommodate him because it seemed interesting at the time. However, I later realized the results aren't optimal, and there's much less variability in maze generation. The algorithm I use probably isn't quite right. That's not to say I won't consider it, but I'm unlikely to satisfy you.