It'd be useful if InControl could generate a default preset for potentialspawns.json based on available biomes and mobs with their vanilla spawn rules on first run, to make it easy to edit. Right now it's a game of guessing the mob name and biome name.

This is a bit hard to do as that information is not easy to obtain in code.

But next version there will be a /ctrlshowmobs command that will list all registered entities at least. So the mob name guessing should be gone