Set PDF Document Catalog parameters for ViewerPreferences

I found the following reference for PDF's , http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf.

 

This indicates that there is a "ViewerPreverences" Dictionary in the "Document Catalog" that can have properties set. The property that I would like to have set is "PrintScalling" but I do not know how to do this using PDF creator or ghostscript.

Thank you,

Collin