I don't know if I overlooked this or not, but how are you guys handling movement since it's on a massive scale?
Our gaming group is made up of 6 players/1 GM who never see each other face to face anymore. We started as a run-of-the-mill group in the same town and all. We started using Maptool to allow one player who moved away to continue to be part of the group. As timed passed, we are all living in different cities(states even) and thankfully Maptool has kept the gang together. When we started playing over the web D&D was the game at the time and we needed something that could handle the tactical movement and we chose Maptool, now it is what we use to play ANYTHING...
to answer your question about movement, we don't use anything within the framework to handle movement. Movement is handled through the narrative by the GM. Maptool is an awesome tool to track pretty much everything that needs to be done "at table" but specifically with M&M it becomes challenging to scale movement and ranges. We use the framework to handle our conditions, dice rolls, damage and that sort of thing. We kinda pile the tokens in the middle of the map and just let our imaginations handle everything else.