Okay, just a quick comparison between Poser and DS and some findings. I compared it in DS3 Advanced with Figure Setup tools, and in Poser 7, and PP2010:

When a bone is non uniformly scaled, along a Y axis for example, in Poser, the SmooY parameters stay static - as in do not change the "Y" location, as the bone location moves. This way, very quickly the mesh falls out of the bend influence zone and produces the stairstepping effect.
When a bone is Uniformly scaled (XY and Z) the smooY parameter moves/scales along with the bone in Poser.

The other three JP's, XYand Z rotation move, movements and scaling move and scale with the bones or joints as they move around. This is the same in both programs.

In DS, the smooY parameter moves with the bone even when it's non uniformly scaled (in poser it stays static) - this way the mesh doesn't fall outside smoothing influence zones as quickly, producing a smoother bend.

So, I guess I can see why some people would consider it a "bug". I can't think of a specific reason why make all the other JP's move around with the bone, except for smooY parameter, and only when it's scaled in one direction. When the whole bone is scaled, the smooY does move with the bone.  First impression is, it looks like it got forgotten.

Maybe there is a specific technical reason why this was done in poser, if so, and someone knows what it is, please stop by and explain.  Kitty (and others I suspect) are dying of curiosity here.

I guess a possible fix for this would be to have a separate set of JP's for Poser, where the smooY parameter start and end locations are ERC'd to the bone Yscale. IRRC JP's can be INJected, but not REMoved, so Poser users would have to load a figure, then INJ the Poser JP's.

What I don't know yet is if that's the only thing that affects the smoothing or not.

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Renderosity Store  Personal nick: Conniekat8
Hi, my name is "No, Bad Kitteh, NOO", what's yours?