Excellent stuff - the NTSC Speed is a great addition! Could the "only symetrical levels" option be implemented as well? Would be awesome!
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.