What no save 'button'?

I would like to add a SAVE button (cntl-S) to the Main toolbar. I am flabbergasted there is no option to add a save button to the Main toolbar. Any way this could be an option in the option list? Thanks!

Why would you need that? Scrivener saves automatically, every time you stop writing for a few seconds. It has already saved before you have managed to find and click that icon.