I mean, if nothing's gonna be done for better resynching, please at least incorporate the likes of keepstuff.lua IN VANILLA, something that respawns players that had synched out with their rings, score, lives at the last starpost they hit in a level if they do rejoin. It would honestly make the whole netgame thing a lot more bearable since getting kicked out for bad synching wouldn't mean losing everything.
But how would that work? Another player could join and have the same node as yours, stealing all of your stats. If it's name-based, someone could try to join with your name, and get your stuff.