Instead of hardcoding biome names in the geolosys.json, would love to be able to put in biome dictionary names instead. This would make things easier for packs with a vast number of biomes in them.

It's not clear in the docs (I'll get to that), but you can - you can use keynames like DESERT in combination with specific biomes (i.e. biomes: [DESERT, minecraft:plains] is valid)

Oh thanks, that's awesome. I guess I should have just tried it first.