With "in harmony", i meant that both vertices that are joined in the weld have the same morph target delta. I tried a bit more with the Poser-8 smooth-morph-brush, and I managed to let it set different values at the involved vertices. So there seems to not be a best solution. I guess its pose-dependent, and one has to find settings that work good in most cases.

And yes I agree, this will hardly count as a bug in the eyes of the support ;).

I will try another experiment. Maybe WorldNormals() can be used to study the effect of morph target deltas on the normals. With lots of luck I can apply my algorithm to the normals in a similar way as to the vertex movement in the morph. If that work, I could develop a script that generates a smoothing morph, which does not move any vertex taking activly part in the geometry deformation but contains just the morph deltas required to repair the shading dependend on the current pose.