If someone would be kind enough to provide me with a test map, I'd be happy to add functionality to extend the tile limit! Unfortunately, I'm not in a position to use the map editor on my end at the moment.Sorry haven't seen your reply.
Any map that you modify and add new map tiles. I haven't done any map myself, just modified others, so publishing it is not the best solution.
The map above was simply to illustrate the example.