Hi Matthias,
So I thought, might it be possible to implement such PDF manipulation scripts and commands into Evince so that dummy users like I (usually...) quickly can convert, merge, reformat etc. the opened PDF file?
I know the Debian developer Paul Sladen has been working on a tool called Impositor which is designed to manipulate PDFs like this:
http://www.paul.sladen.org/projects/ It might be worth asking him how that's coming along. Cheers! Daniel