I have to sign a lot of PDFs with a "signature" or stamp them with an "approved" mark. It's a silly thing to need to do since the processes that require this were designed for paper but run electronically.

It would be very nice to be able to stamp a document with a "stamp" or picture of a signature - I know there's other ways to do this (personally I faff with pdftk) but it would be a super-nice feature to simply open the document, stamp it and save/send it.