If I want to alter the probabilities of say plants spawning, do i need to set "Enable Custom Ore Spawning" to True?   Or Custom Spawning per resource to True?  Or both?
Also:  for instance, the setting for biome probability is 0.3 -- is that "30% of the biome will be covered" or "0.3%" or 30%.   
The plugin is fantastic,  I just need a little information on how to configure this part of it.