I'm not sure about the "synched to the slowest" thing, but IIRC the browser includes a chat room type set up that should help you avoid being tied down by people with slow connections. Good for setting the conditions for a game too.
As for cheat protection, if it's P2P I would think they could have your machine check incoming info and object to any imposibilities... or keep a log of it. Just a thought.
This comment was edited on Aug 18, 21:23.