With the rise in pixel art maps, I think it would be a great idea, if it can be done, to add a custom crafting recipe (much like the elevators) that turns a map into a locked map, which can't be copied, and if a simular thing to the image vouchers can be done, change it's location so that it can't be broken (IE updating the map)

Sorry I have been making a lot of suggestions lately, but I think this one would really show suport for player made meta.