Incredible!
It does almost everything. ;o) It is a joy to see.
I have tested with less directions and that works fine too.

What it does and does not do:

Renders the directions -1, the last one.
Renders the amount of frames in the animation but with the first frame as motif.
Changes Pz3 file with no problems.
Accepts other amount of directions ie 4.0, 8.0. etc. with no problem (besides the -1 rendering of last direction).
Stops the script correctly.

So, are these major problems or can they be solved?
The script is useful even as it is. Saves lot of work. But "me want more"! :o)