I wish I knew more about Swords Without Master. I like the idea of a gm-less mash game. And the tones you use have great names.
Viewing post in Unformed, incomplete ideas thread
Swords Without Master has a GM by default, but the way it's set up into structured phases would be super-easy to make GMless.
On the other hand, I don't know anything about MASH except what I learned from that episode of Futurama.