The Transmogrifier is really cool, but it only works between games that the player created/owns. If a player is upgraded to GM on someone else's game they are not able to transfer content to this game because they are not the owner. As a DM/GM I would love to be able to transfer some of my more complex maps to a friends game. We are DMing in the same canonical universe, and the ability to transfer between us would make this cross-game interaction more feasible and fun for all involved.