Created attachment 176277 [details] Can't configurate the Update widget because it doesn't appear until a update is available. The "Update is available" widget and other widgets are only configurable when they appear. It would be better if you could configurate how all of these icons behave while they're not active.
The screenshot shows System Tray Settings -> Entries It's reasonable to want to change a setting when you think of it without waiting for that icon to be present in the system tray
*** This bug has been marked as a duplicate of bug 495651 ***