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You can do this in Inifinity with no issues. The terrain generation wasn't changed at all between versions, they just added some mods like Thermal Dynamics, changed some configs. and updated a few of the existing mods to newer versions. I have been on 1.2.1 since it was released(not recommended) and I trimmed my world like you mentioned with MCEdit to see if the issue with emeralds not spawning was fixed. There are no noticeable boundaries where I pruned it. It regen'd exactly the same.Ahh thanks for the advice!. In the past i have gone into the world editor and simply deleted all the chunks that i generated except for the area i built but this isnt the best way because it tends to screw up the borders around the part that i dont "regenerate"