Hi Andrew,
Maybe it would help if, instead of using <ctrl> O, a button is used to access these additional 'Hidden' settings, like the buttons for [Networks...] and [Setup...]. There's enough room on the left side, below 'Volume unit' and above 'Monitored interfaces'. This would avoid the issue of the settings being 'too hidden' since users don't always read the (excellent) Help file instructions even when there's a button for doing that, etc. etc....
And obviously the 'name' should be changed form 'Hidden settings' to 'Additional settings'
J