Global printing options for all clients?

[Matthew Ford]

I have a color inkjet printer, with an option "-o CNGrayscale" provided in the driver for grayscale printing. Since not all client software provides a grayscale printing option, I would like to set up two queues: one for color printing and one for grayscale. At first I tried setting this up using lpoptions - but it appears that the /etc/cups/lpoptions file only affects local print jobs submitted via "lpr", and not jobs submitted by remote clients. How can I set the grayscale option as a default for ALL jobs in this queue? Something in the printers.conf file, perhaps? I did not find anything in the web interface.

thanks,
Matthew.