I did something like this at SPSS, using dynamically generated EPS embedded
in the document. This will only work if you're using Distiller; if you're
using direct-to-PDF, then you'll have to go through Arbortext's mechanism
(which is probably easier anyway, if it's an option).
Anyway, the idea is this: as part of your publish procedure, you generate an
EPS file containing the PDFMark commands to set the default view. You can
control the starting magnification, target page, document metadata, etc. If
this seems weird, keep in mind that EPS files are really just text files
containing the postscript commands to draw the desired figure. In this case,
instead of commands to draw a figure, you include commands to set the
document info. Then you insert a reference to the EPS in your document, and
the PDF info gets created when Distiller does its thing.
If you're interested, let me know and I can send you more details.