As biomes are determined by noise placement, easily substituting in biomes for any given terrain generator is rather hard. Something to allow substituting in biomes of similar types via a worldgen modifier (and based on noise values) would be extremely helpful.

An example use case would be a mod adding several kinds of beaches and rivers, each tuned to a different 'set' of temperatures. Using a biome substitution modifier based on temperature would allow them to work with any worldgen (such as Tectonic) without needing to specify different methods for each or to use something like Terrablender (does Terrablender even have this feature? I couldn't see it on their documentation but I didn't look incredibly hard).

For the moment I'm not going to touch biome layout stuff in Lithostitched: It's very expansive and a lot of effort needs to be put in to have a clean and functional format for modifying it.

Until I get around to it, I highly recommend Biolith which has data-driven biome layout replacements/modifications.

Understandable! Thank you so much for all you do with Lithostitched. If I do get around to adding biome replacements before Lithostitched gets the option, I'll definitely look at Biolith for them.