Currently, page numbers can be added when a PDF is downloaded, but only in a default font, colour and positioning, which ALWAYS looks messy on a doc you've spent ages designing .

Additionally, it would be good to see these page numbers before downloading the document, incase you need to refer to a page elsewhere in the document.

Yes please. Page number can only go in the middle, in a default font and colour, which means they pretty much always look awful, on an otherwise beautiful document.