Modular Biome Customization in World Settings

Summary:
Add the option to check/uncheck specific biomes when creating a new world. Want a swamp-only survival world? BAM. Want to suffer in an endless desert for 100 days? Go ahead. Or just want to remove mangrove swamps because you're tired of swimming a kilometer just to find a single cow? You’re the climate god now.

Why it makes sense:

• It doesn’t break the vanilla experience — just gives players more intentional control.

• It opens up creative and survival challenges (like biome-specific hardcore runs).

• It lets you avoid biomes you find annoying, irrelevant, or just plain ugly.

• It’s a natural evolution of the “world customization” that used to exist in older versions.

🌩️ Bonus idea: Weather toggles too?

While we're at it — having a similar system for weather would be amazing.
Imagine being able to choose whether your world has rain, snow, or no weather at all.
Perfect for hardcore challenges, peaceful builders who hate storms, or anyone who just wants a clear sky while they’re philosophizing on a mountain.

Biome control = environmental control = more creative freedom.