I am not sure if this has been posted but I noticed that by holding the crtl-alt keys down you will see short-cut letters next to the corresponding buttons on the UI. See the attached image.
Whilst it hasn’t been anything posted specifically about them, there have been a number of images posted that show these short-cut keys.
Going into the the next level in a menu item like the Real-time Shields, shows many more for the additional options.