I forwarded this to the upstream author. Here is his response:
So a PDF->PostScript->PDF path is more than awkward.
The reasons for not skipping this step are known to you (it will severly
impede the functionality of CUPS-PDF). Furthermore, once again, CUPS-PDF
is not meant for processing PDF-input (i.e., it is not meant to be a
PDF-manipulation tool).
1. Use the CUPS options for N-up, reverse order, selected pages, scale-
to-fit, ... They are all executed by the pdftopdf CUPS filter and user-
accessible by the GTK printing dialog (later by the Common Print
Dialog).
Those apply to the pdftopdf filter of CUPS. As for pdftopdf: see above.
2. Enhance the pdftopdf CUPS filter by adding more page manipulations to
it (patches welcome). This would offer these page manipulations also to
queues which print to real printers.
I am certain that pdftopdf can be used as a great PDF-manipulation tool
- but once again: that is not what CUPS-PDF is made for.
3. Use pdftk instead of Ghostscript in the cups-pdf backend.
And once more: with pdftk one can modify PDFs. CUPS-PDF is made to
convert non-PDF to PDF.
So, what is being suggested here is to have a tool that can drop
printjobs to defined directories as CUPS-PDF does but does not convert
PS to PDF but manipulates PDF instead.
Just for your understanding why I am so adamant about CUPS-PDF not
relying on PDF-input: I never developed CUPS-PDF as "latest-and-
greatest"-tool, but as a tool we employ in our labs with several hundert
students/workers and a very diverse IT-infrastructure. With respect to
printing, PS really IS a common ground to start from. PDF is entirely
unknown to several of our installations.
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https://bugs.launchpad.net/bugs/820820
Title:
cups-pdf should not convert PDF print jobs to PS then to PDF
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