So I have taken a look at the readme and the actual string. I am wondering if I can make this compatible with just adding the textures to the terrain_codes? Looking at the world2.lua I can't tell how the converter is translating the tiles to the actual world. I also see that you add a special character to the string for terrain_codes and am not sure what the purpose of that is.
((212,218,174), "G", "grass-dry")
As far as I can tell: ((<RGB color on map>, "<?a letter?>", "<the title of terrain to use for the color>")
Anyone else have thoughts on how to get the generator to work with an outside biomes mod?