I have searched and also didn't see anything. Is there any way (homebrew) or if none exists, then we need one, where you have a single place to turn on/off the various notifications...almost like a notification manager, where it lists any app that uses notifications and you can turn them all on/off or individually. On the weekends when I'm out and about and can't continuously charge my battery, this would allow me to control which notification services I need versus those that are nice to have and allow me to save battery life, etc.. Also, after loading so many applications, I can't tell which ones use notifications and which don't without going into each app and checking the preferences.