Cool idea. Btw I didn't know you could shear maps

. If everyone has their own folder then take into account alllllll the maps that have been made by allll the different people. Even the bad maps that are all bugged will have their own folder. And how far back do you ever go to look for maps? I usually go at most 3 pages back, and I bet there are at least 3 pages worth of map makers. If people decided to make maps on multiple id's this could become a problem aswell.
However an alternative to this would be to search for the map you are after. Or you could check all posts by a person and look for their posts in mission sharing and narrow it down from there.