Comment 3 for bug 339847

None of the changes I described in <https://wiki.ubuntu.com/NotifyOSD#system-config-printer> involve using notification bubbles, with actions or without. They involve eliminating notification bubbles, and I think they're just as valid on a system where the notification server accepts actions as on a system where it doesn't. (They reduce the total surface area of the interface, so people have less to learn or think about. And in the "Printer added" and "Authentication required" cases, they make the number of clicks required either the same or less.)

So, I suggest first seeing if upstream will accept the design changes described in the spec. If they will, make the changes unconditionally. If they won't, *then* make the changes conditional on whether the notification server accepts actions.