This is a suggestion for a Console Exclusive feature as a "compensation" for our limited-sized worlds. Since TU31 has come out, I have generated many nice worlds, but missing both podzol or mycelium. My thought was that if the player wanted to create a mega-taiga biome, they could 1) locate a regular taiga biome in their world 2) plant addition spruce saplings in 2 x 2 groups in those biomes and 3) wait for the trees to grow into regular tightly spaced spruce trees, and then 4) add bonemeal to those fully grown trees, growing them further into the large redwoods. Finally, if 4 redwoods are produced in single chunk taiga area, over time the soil in that chunk would change into podzol.
The idea of throwing bonemeal at fully grown trees to create mega-versions of those trees within their natural biomes could be expanded to all varieties of trees (e.g. to get the extra tall birch trees or dark oak trees). This would enable players to make experience a "land of giants" type survival map if they so wished... something that is not ever likely to generate naturally in our limited-sized worlds.
BTW, I still would prefer the ability to select, prior to world creations, the biomes we'd like to see in our world and approximate percentages of each... without sacrificing that world's survival status... but this suggestion would be an alternative to that.
I like the idea of manually creating biomes within a chunk or several chunks. An alternative could be a craftable thing which you place within a chunk and then once you go far enough away that it degenerates and come back, it has regenerated as a randomly selected biome.
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But if your a magician, and I'm a palaeontologist, then who's flying the plane?
Giant redwoods and dark oak trees can already be grown by putting 4 saplings in a square and either waiting or using bone meal.
And I think it makes more sense to have a crafting recipe for podzol, using 2 course dirt blocks and 2 grass blocks, or something
I agree. I posted this suggestion too soon (before I had worked with some of the new blocks. I just knew that everyone seemed to be hunting for a mega taiga and not getting it. I can't really delete this suggestion, but I personally no longer support it myself.