'Classic' World Type.

This would enable pre-1.18 world generation when creating a new world. Post-1.18 biomes would still generate (for the exception of the deep dark and possibly mountain peaks) but follow pre-1.18 world generation.

Though the post-1.18 generation is cool and makes exploration more interesting, the old world generation before with its water lakes and more varied biome distribution still catches the original look and feel of the game.