Results are in:
I found the following excerpt from David Blatner's "Real World QuarkXPress 6" on the
creativepro website here:
http://www.creativepro.com/story/fea...ml?cprose=5-04
I found several other references to QuarkXpress writing postscript and having Jaws distill it. So as it stands, the flow remains 'application - postscript - distill app' regardless of what the packaging tells us, meaning that both print and pdf settings need to be checked on Quark 6 Mac to ensure quality PDFs. The Mac operators here are busy today so I can't test it out, but if someone else can clarify that'd be great.
I believe the Write to Postscript for later distilling' merely postpones the distilling. The postscript file written by Quark is similar to the temporary files all applications create when you open a document - temporary files written to assist the application process data, but it is a postscript-distill process nonetheless.