I want to be able to add a custom map_#.dat file so I can have maps with custom images. My server, however, is way over 200MB, so I can't just download and reupload. In the folder viewer, I can create a custom .dat file, but I cannot add data to it since the file viewer is based on text files.
Could you guys consider allowing .dat files to be edited with an NBT editor of some sort, or (probably less likely) allow uploads of .dat files?