The is a problem right now where the picture file used to display terrain on the cloth map is hardcoded. So if people want to add new terrain, they must use a terrain type that already exist.
My suggestion is that you add a field in the TerrainType data structure where you can specify the file to use for displaying that terrain type. You can make an exception for mountains if you want since there is many different pictures used.
You could use something like
Code: xml
- <ClothmapTexture>Gfx/TacticalIcons/WorldMap_SwampTiles_1.png</ClothmapTexture>