Hm... seems to me like another map editor for the 1st generation games... oh wait, it is! At least I really do hope this map editor becomes better than Redmap, BluMap, and PokeMap. However, wouldn't it be a good idea to also add support for Pokémon Yellow as well (like what Miksy91 said)? Because those three sure do fit in the 1st generation saga. It can all be made into a map editor that would work very much like what AdvanceMap does. ;)
It could also be possible to add support for Pokémon Crystal in JohtoMap as well. ;)
Oh wait! I have another great idea! It could also feature a built in hex editor as well, so you can fix any problems with maps or even any routines that are used.