A couple of other suggestions:

1. Depending on how sophisticated your printing hardware is you might be able to set this up from the printer end of things. You would need to be looking at workgroup class printing hardware with some reasonable print administration capabilities.

2. Modify printer PPD files. Printer options available through Mac OS X Print and Page Setup windows are established by a printer’s PPD file. By editing the file it is possible to change defaults or limit options available to the end user. This only works if you have control over the end user’s computer, such as in a computer lab. Using this method I have been able to do things like deleting paper sizes that weren’t available to the end user (we don’t permit user supplied paper manual feed situations)

Hi,

I’m guessing you are using your Mac OS X Server as the Print server with all of the queues set up on there. What you could try is setting up two queues to the same printer. Then load up the CUPS web interface on the Mac server by typing localhost:631. You should be able to see all of your printer queues in there. We use this to set up all of our queues as it gives much more flexibility than the ServerAdmin.

Anyway, once your are in the web interface, there are options to change settings on a print queue – and within there one of the settings should be to restrict to greyscale printing only.

let me know if this works for you.