Excellent post. This is probably one of the most constructive things I've seen on this board.
I actually sent Raven an email not too long ago, suggesting the same ideas in regards to special moves, stance differences, and blocking abilities. I never even thought of stamina. Good idea.
To me, stances should just contain different moves... not different speeds. What good does it do to wind up for a lightsaber swing? It has no physical weight...
Taking it to the next level, stances could be the difference between 1 saber / 2 sabers / and a dual bladed saber. Additionally, you would have to select your stance before you join the game. That is.. unless you pick up someone else's saber =)