But it would happen automaticly like when you create a save then you would have a chance to select option like "Indirect Multiplayer".And it would only download your friend's save when your game starts.It would kick you out of game(and save it) and it would show a progress bar and when it would finish it the bar would finish and close it would allow you to again get into the game,and if your friend would close the game in say 1 hour and start it then it would ask him "Download again?".I think it's already possible.