I suggest include the button : add driver.So, the user could add PPDs drivers to manage the printer. This would the chief advantage use Gnome instead of raw http://localhost:631/admin frontend : flexibility and adaptability.
GIMP didn't included a driver for my HP Deskjet 640C. Where can I obtain one ( I tried to use and install cupsomatic and corrupted cups system : I couldn't prin anyting).
Regards.