World with Specific Biomes?

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Flexico

Well-Known Member
Dec 15, 2012
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In the "Customization" option, I can select a specific biome for the world to generate, or just all of them. Is there a way to select several biomes, and even choose their relative abundance?

For example, I want to create a world that's mostly Ocean and Deep Ocean, but has occasional large islands such as Forests, Dark Forests, Mesas, Ice Spikes, and Mushroom Islands.

Anyone know how to do this? (Without mods ... or with mods if the world will work in vanilla once created.)
 
ATG might be able to do it and be vanilla, because I think it only modifies vanilla terrain generation.
ATG has to be installed in order to keep generating the new chunks. Plus it doesn't give any customization options.