Say, if I want to change the spawnrate of a Creeper in any biome it's registred to spawn, I'd like to put in the config file something like

<entry id="Creeper" mobName="Creeper" rate="50" minGroupSize="1" maxGroupSize="2" creatureType="MONSTER" remove="true"> <biomeFilter type="any"> <biome type="ALL" /> </biomeFilter> </entry>

Or something like all biomes that are currently registred in the biomedictionary.