Please PLEASE create a greyscale importer by default in the editor. Don't make me make something like this again.

https://github.com/Celludriel/DOS_Terrain_Importer
https://github.com/Celludriel/DOS_Terrain_Lib

Do you have any idea how much headaches this gave me when I made it :p Not even sure they still work I haven't maintained it with future patches. Nobody was using it because the toolset was to complex.

Try and take a lesson from NWN 1 , make it easy and accessible for most people. Make it fun to use and mods/campaigns will follow. Make it to complex and it will fall on it's bum again frown