I have the package setup to read PDF keywords and title correctly, is there currently any way to write new information (keywords, title, etc.) to a PDF and save the file?
No. pdfutils has very limited support for writing PDFs. This may change in future, but at the moment we are bound to the features poppler and cairo are providing.
I have the package setup to read PDF keywords and title correctly, is there currently any way to write new information (keywords, title, etc.) to a PDF and save the file?