Forgot to mention: to create a symmetric morph directly in Wings, I need to split the mesh in half, then use a virtual mirror while editing, and at the end "freeze" the mirror in order to create a whole mesh again. That process messes up the vertex ordering, which I need to restore with a separate program. Sometimes there's simply no way around it because I need to judge the symmetric version while working, for example when I morph the face or the front of the torso. But in other cases, say if I work just on the arms or the sides of the hips, it might be easier to do one side only and have the other one created automatically.

-- I'm not mad at you, just Westphalian.