@codebrainz
it's not very obvious or keyboard friendly, but it's still better than the current no UI.
I think hovering over the info icon is intuitive. I agree clicking the icon is unusual and has no keyboard option. I also wondered about having an 'Advanced' checkbox as the action widget of the prefs notebook, which enables/disables editing for overridden project prefs, and also enables/disables the Various prefs tab.