I have an idea as to how multiplayer could do timewarp, this may have been thought of already, but I will still bring it up. I call this method the "Catch up"       The whole idea is that one person can do a mission and timewarp through and stuff, but the other player sees the craft at whatever point it is along the mission. Then after the mission you go back to the oldest point in time a player is playing at. For example, I have a dres mission, but the other player is flying a plane