Can I with code get the navigation tree that Structual Navigation uses?

Hi,

I want to (in some special cases) display more then 3 levels of nodes in the Global Navigation.
If I understand this correct this can be done by creating a custom PortalSiteMapProvider that creates
a node tree with all the levels I want.
However I still want to be able to edit order and hide elements via standard SharePoint and have this
be reflected in the menu.
This means I want to in code be able to get how the "Structual Navigation" on the site is configured
when I build my custom node tree.
I have searched the web and talked to people but none seems to have any solution to this problem
so any help is greatly appreciated. 

Br,
Calle