[Funkd]

Yeah you could add a key map that calls the toggle. See http://kodi.wiki/view/HOW-TO:Modify_keymaps

Then call : Skin.ToggleSetting(showscope)

Try the following. Save below as keymap.xml in the userdata/keymaps folder and restart Kodi

Code:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<keymap>
    <global>
        <keyboard>
                       <F8>Skin.ToggleSetting(showscope)</F8>
        </keyboard>
    </global>
</keymap>

When you press F8 it should toggle the scope bars. You can use a different key.

And yes the same could be applied to audio. But that's a lot of renaming and rebuilding the library
If audio was wanted we should really have naming format like "Movie Title (2014) AR-2.35 AU-7.1" or something like that.