Well... this is what I got From SM:

Thank you for the additional information. I have been able to reproduce what you describe and I will be writing this up as a report for the engineers.

In the meanwhile, I have a feeling that this might only have been introduced in SR2. So if you would like, you can try uninstalling Poser, reinstalling it, and then applying just SR1 (you can redownload it from your order 307224 if you need to - I just reactivated the download links for that order for the next day) to see if the Master Parameters work any better for you then. Please let me know how this works out for you if you do try this.

As for documentation, there is no guide to the master parameters aside from what is written down in the manual, most of which is around page 600 and thereabouts.

 

            “So, roll me further B_t__h!”