SvA - 2020-06-04

I don't quite understand your request. What is it exactly you are requesting?

Your solution, adding a section is perfectly all right (you use [S] for "Selah", I use to do the same thing using [I] for "intermezzo" or "instrumantal". Even though I dows not conflict with an accelerator key for any other function, only those corresponding to the predefined sections can be used to directly jump to that section.
Another option is to add a slide change marker "||" to the end of the last line of the section before the instrumental moment (if the instrumental moment comes after the section) or slide change markers on two consecutive lines (if the instumental is in the middle of it).
This leaves title and subtitle on the screen, which is fine in my oppinion
The solution if the interlude was not preplanned is to either press H or go to the blank space before or after (whichever suites you).
Your request, as I understand is, is to hard code H (Hide) once again?