I looked into the Mo' Creatures bug, but I'm pretty sure it's on their end and has to do with the spawning utility they use (it disables Vanilla spawns, and Prehistoric Spawns uses the vanilla mechanics).
The mod should already be compatible with maps-- the map creator would just have to create the world with PS installed
The Meaning of Life, the Universe, and Everything.
The Ethereal Time Frame
Can you make a version of the mod that allows us to edit where dino spawns occur? For instance, if somebody downloads a dimensional travel mod, and they want dinosaurs to spawn there instead of the overworld would that person be able to configure in the config file the biome id of the entity spawns?
Why only in the plains biomes? I don't see any support for tropicraft. Also why did you do this when JAS could do the same thing unless you had a pre-configed thing for the overworld, disable overworld, the Erebus and tropicraft support.