I'm using CUPS to print on an enterprise network. The job gets submitted fine, but I need to submit it as another username. Now I'm jon but I need to send it as say jonallard.

On the command line, one could print as such

lp -U jonallard -d printer1 file.ext

How do I customize the username part when using the GUI printing dialogs and the Printing system settings?

It is possible that it isn't, in fact, possible to add this username to the Ubuntu print config. If so, where should I ask for an improvement?