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That's because the Poser 8 people have the extra capsule falloff zones that DAZ Studio doesn't recognise. Starting with Poser 8 and Poser Pro 2010, Poser now has extra falloff zones for making smoother bends and twist in figures.

So, basically weight mapping for the rigging?

No, weight mapping allows an arbitrary value to be assigned to each vertex. This is still based on the position of each point relative to a volume defined by geometric primitives, but it adds more options to that system.