I got some help with part of this question: How do I modify the message notifier widget in the Unity global menu?
But I'm wondering more broadly if there is a tool to tweak the Unity Global Menu. With a gnome panel I used to be able to right click and get the options right there. In Unity I can't see a way to access any options. Where are they?
I've looked at What Application Indicators are available? and How to hide items in Unity's top panel? -- is there really no centralized management for this menu?