I suggest to implement the following feature:
Print one or more existing PDFs (attachments) together with a ListLabel report.
A typical use case might be:
Creating a custom report with ListLabel and add existing documents to it, to have only one PDF with all the informations.
This is already possible with the PDF-Object, but the orientation (portrait / landscape) of the pages in the PDFs will be fitted to the size of the PDF-Object.