PrimoPDF is free at
http://www.primopdf.com/, NitroPro is the free trial before purchase application - the free one is that to which I was referring, NitroPro has PDF creation, editing and conversion tools.
PrimoPDF installs as a printer, and page size and % scaling of the document are set in the standard print dialogue that comes up as it does for all printers when a document is sent to them. The scaled document will show in the print dialogue preview window overlaid on the selected paper size.
From memory PDF Creator worked much the same in that respect but I have not been using it recently - that because they changed it significantly in a beta release and that seemed to have some things missing. It looks as if that has gone to stable release now but I have not got around to trying it.
I'll have a look at the latest PDF Creator version when I get a chance and report back here.
John