I have an HP DeskJet 812C. My dad has an HP DeskJet 990C. On his printer, with his drivers, I can select a paper size of "4x6 with tear-off tab," which is precisely what I have to print on (HP Premium ...
As noted by the following statement on Epson's Web site: "Some printing features are not supported in Mac OS X, including custom paper sizes, banner printing, booklet printing, and watermarks.