I think I am finally done.
If IK chains are active, the results are completely broken.
No idea whats up, but WorldVertex seems to go berserk if IK chains are active.

But if they are turned off, it seems to work just as planned!

I posed, scaled, bent, twisted the characters and even tortured them with a wave deformer. And still the morphs load at an almost exact precision!! The limit to precision were just the rounding errors of my deformer. Just hope P8 and 2010 behave the same.

Now only have left to review the code for harmlessness and package it to get it into beta.
But as I only have one I/O  "open(filename) "  and python documentation says default access is read-only, there should not be much to be afraid of :). Cage, do you agree =) ?

Maybe someone can help me where to get an "as-is" no-warranty disclaimer that I could use?