Board Thread:General Mod Discussion/@comment-28593934-20170115060120/@comment-26172435-20170116154342

As far as I know you can't just adjust a switch using WE to make the mod believe a chunk has changed biome. If you effectively want a different biome generated on a pixel of the map, just edit that pixel to have the colour corresponding to the biome you want it to become. Then delete any corresponding generated region file from the world and restart the world with the mod including the adjusted map image file. After regeneration of the area you wanted changed, you can paste in any build you like ofc.

If however, there is a way to effectively* adjust lotrmod biome using WE, I'd like to know that too. * I know form experience with WE and a heavy plugged-in spigot server and Conquest as server texture pack we could adjust the appearance features of generated biomes by applying a trick that simply modified the colour schemes of the existing biome of a block to any other biome. If you're looking for that option, check MetaCycler.