hello. my first need-suggestion is biome sizes. medium is a bit small, but large biomes is giantly big. can you add a medium-large thing? :D
and my second need-suggestion is customization the generation. i want to disable gem ore spawns in the config by default. and also for the biome size too. it would be perfectly helpful. thank you.

Second suggestion is already planned in #815

The biome sizes go up in increments of 1 already, so no, we can't add a "medium-large" size.