I think it would be good to have some parameters to further control the standard behaviour of this extension.
- A parameter to set the text to be shown in the header
- A parameter to set the text to be shown in the footer
- A parameter to set the standard paper format, e.g. letter or A4
- A parameter to snow the advanced options i. e. document restrictions (password protection, allow modification etc.) to users on Special:Pdfexport or not