I know this will more than likely never be finished, but just a suggestion in-case you're bored someday and decide to mess around with it.
I was looking for a map to edit today, and it took me around 20-25 minutes to actually find the specific map I was looking for. The reason it was so hard is because I had to pick randomly from around 400+ maps.
I think it would be a good idea to add a page for loading maps, where you choose a folder and it displays the maps names to choose from, making it a hell of a lot easier & faster to dig up and edit old maps. Any good?
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Web developer, currently looking for graphic artists / designers.