NavigationGroups: two level?

Question 1: is it possible to add two levels of Navigation groups? (Rather multi level groups)

E.g.

Settings
-> User Management
--> Accounts
--> Roles
-> Locale Management
--> Language
--> Currency

Question 2: what is the advantage of defining navigation groups in the panel config (service provider)? (Other than being able to associate an icon to the group & making it collapsible)

We can already configure group in the resource.

I have added the groups in the panel configuration, they don't appear in the sidebar. Why do we need to add the NavigationGroup in the panel config?
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