+100 Seem like a standard thing that if your in the Setting window you should be able to navigate up and down the items on the left (or right) using ‘UpArrow’ and ‘DownArrow’, and then ‘Ctrl + Tab’ to to toggle the focus on the right or left of the Settings window. Then page up and down could work on the scroll bar.
At least ‘Esc’ closes the Settings window. And ‘Tab’ cycles through all input fields on the right.
I find it odd that the focus of the Arrow keys remains on the underlying open note. If your smashing keys to try and work out what works in the Settings window this edits the underlying note and mucks it all up. Can’t see why this would be deliberate, or am I missing something?