Why does the hpglrtl.pltcfg (as well as pdf, tiff, jpeg, etc.) has the "Copies" button grayed out, but the hpgl2.pltcfg (as well as pscript and printer.pltcfg) do not?
The reason for this is a limitation of the language itself. Replots is supported as language instruction in HP-GL/2, but doesn't work with RTL. That's probably because HP-GL/2 files are usually small, but HP RTL files can be very large. The HP RTL firmware can't make any promises about the ability to perform replots, and errors on the side of not doing them at all. There is a PostScript replots instruction that works in all PostScript interpreters with on-board memory. There is no way toembed a replots instruction in a TIFF, JPEG, or PDF file. With the Windows printer, we send the number of copies as a command to the Windows spooler, and it takes care of the rest.