Enhance Nav_Menu to use the older menu functions

[WraithKenny]

Concerning wp_list_pages, wp_page_menu, and/or wp_list_categories functions:

Since these functions exists and developers are comfortable with them, and they'd add much functionality if they were included in the new wp_nav_menu function.

Could the wp_nav_menu utilize these established functions in itself to allow "dynamic" listing of pages with the useful options available in those functions?

New "widgets" on the left among the "Add Existing Page" and "Add an Existing Category" (perhaps "Add Dynamic Page List" or the like) that would essentially be a UI interface for the args that the wp_list_pages, wp_page_menu, or wp_list_categories functions already accept. The wp_nav_menu would then pass those args to the appropriate function and create items in the appropriate place in the nav menu. (I have no idea how easy/hard that'd be.)

This wouldn't replace the "Add Existing Page" or "Add an Existing Category" as starting at zero and adding individual items is different and also very useful.

This treatment might be appropriate for any function listed in "Related" ​http://codex.wordpress.org/Template_Tags/wp_list_pages#Related or maybe only wp_page_menu or wp_list_pages. I think it warrants discussion.

P.S. This is well above my ability in PHP. I don't think I can't do a working patch on this :-(

Allowing developers to create their own type of menu item isn't the easiest given the way the current system works. I'm working on fixing that, but that'll be for 3.1.

Add capability to add a menu as a menuitem to be a submenu thus allowing multiple menu items to share the same submenus.

See #12934

#14969 related/duplicate

​http://www.viper007bond.com/wordpress-plugins/add-descendants-as-submenu-items/

Alex wrote a plugin that basically solves this so I'll close the ticket. Works for Me :)

I think this functionality is worthy of being in core. Who wants to manually maintain submenu items? :)

that also sounds good to me, +1