There is a new snapshot for MC out, that features a new world type with “large biomes”. Here is a picture of what that means. I wonder if that would be a good idea for the daklands, if we expand the borders accordingly. Currently the darklands are about 2500×2500 blocks large, maybe 3k or 4k would be better in that case.
Of course this would come only in effect after the next version of minecraft is released.