Yes, you are right on that one.
And your script seems to be very useful for that purpose.
Odf points out that the Zbrush has similar issues, but I don't have any experience with that program,
so I can't say anything one way or the other.

I use a different program to group body parts together, and then work in Hexagon.
Then you can work on the .obj seamlessly.
You can group the whole body too, if you want.
After the work is done, I use the same program to separate the .obj back into original parts.
It's a quick process.
But I love to try your script.
I'm sure many people are waiting for this to be released, like right now!