From a support ticket:
"In the 'Bulk Edit' feature, it would be great to be able to bulk edit the PDF Stamp watermark option. I watermark all of my PDFs, so having that as a bulk edit would be great. And/or if there would be an option to have that automatically 'on' when bulk importing PDF files - either would be great! Just so I don't have to turn it on for each individual PDF document. "