I know that this has already been suggestion but I wasn't able to find it but their should be a setting that allows you to change the biome to that of the blueprint, there should also be a setting to allow you to set the radius of effect and finally the should be a loading screen showing how long until that area is set as the requested biome. Please Suggest Anything Else. But great mod all who works on it 
X 1,000,000,000,000,000,000,000
[Suggestion] Terraformer Option - Biome Overwriting
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Actually I asked a question about this earlier in the week. The only TFBP that can alter the biome is the mushroom TFBP, but the code for it is still flaky and unreliable. I surmised from Richard, it that the biome-altering TFBP's will be added once the kinks are worked out of the Mushroom one.
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Yeah, I imagine this one taking awhile because nobody has really investigated the biome code afaik. Let's just keep our fingers crossed that this is possible at all.