I noticed some broken links in my OP (probably due to a thread being closed) so I need to repost some screenshots.
First regarding the ability to edit the Main Menus via the menu itself:
edit_menus_comp.jpg
Or via the "panel-run-dialog":
alacarte.png
And how to restore the Main Menu defaults:
restore_menu_defaults.png
And how to open 'dconf-editor' using the "panel-run-dialog":
dconf.png
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