It might be prudent to separate the biome ID settings to another file. This way if a user wants to reset the biome IDs (automatically) they can do so by simply deleting the biome ID config file without having to delete the whole main config file. (Similar to how BoP separates their biome ID settings.)
The biome IDs should also be chosen automatically (if the config file doesn't exist), instead of using hard-coded defaults. This way, when Appalachia is initialised, there's no chance of a biome ID collision with IDs that have already been taken.
It might be prudent to separate the biome ID settings to another file. This way if a user wants to reset the biome IDs (automatically) they can do so by simply deleting the biome ID config file without having to delete the whole main config file. (Similar to how BoP separates their biome ID settings.)
The biome IDs should also be chosen automatically (if the config file doesn't exist), instead of using hard-coded defaults. This way, when Appalachia is initialised, there's no chance of a biome ID collision with IDs that have already been taken.