There are two ways you can achieve this. One is to use Presets and the other is to use the CUPS web interface.
With regards to the User Codes, if a user will always be using the same code and they have the only user account of the Mac they use, then the CUPS interface would be better as you can set the code as a default (and b&w printing for that matter). But if a user has different user codes, or they are not the only user on a particular Mac, then the Presets could be a better option.
To create a Preset, select to print a document and with the print dialog open, set the user code in the appropriate menu. Then click on the Presets drop menu (located under the Printer name) and select Save As. Give an identifiable name and select it for this printer only and then OK. Now when you print you can select this Preset and the user code fields will be correctly entered.
You could take this a step further and save the b&w setting with this preset. Or you could make two presets, both with the same user code but one as colour and the other as b&w.
If you wanted to make the settings default rather than use Presets then you can open the CUPS web page (http://127.0.0.1:631/printers/) in Safari. This will show the installed print queues. Select the Lanier queue, this will show another page that will have a Maintenance and Administration drop menu. Via the Administration drop menu, select Set Default Options. With the next page that appear select General and then scroll through the listed options until you see the User Code entry. Set your number and then if you wanted to scroll through to the Colour setting you can also set it to B&W. With these set, scroll all the way to the bottom and click Set Default Options. If prompted, enter your Admin name and password to save the change. Now you can exit Safari and test your print settings.
