Hi list,
I have search the gnome shell extension website, and with google, but could not find any extension which provides a quick access to all the menu and submenu of the active application.
This is really helpfull to activate a menu from the keyboard, especially for submenu ( main menus can be activated via ALT + letter, but you have to remember the letter for each application, and submenu are a pain to activate ( combination of arrows down and right + letters...).
In Ubuntu unity, there was a very handy search tool like this.