What would you like to have changed or added to Vampirism

add a config option to change which dimensions vampirism structure gen and mob spawning have effects

Does this make the mod experience more balanced?

this will make it so custom packs can easily change where vampires spawn so that they don't ruin early game

Can you provide additional resources (etc. textures or models)

I think we can use the new vanilla world gen datapack for this. There you can specify spawns and structures per dimension/biome afaik.
We can change Vampirism to make sure to not add spawns/structures to a biome if they are already present (with a probability of 0)