Belated welcome to the forum!
I know of at least one vehicle here with a dual-button stop/start: press button "A" to stop, button "B" to re-start (just spliced into the starter circuit).
You wouldn't want to have to hold a button to keep the engine shut off though. Imagine you've cut the engine while approaching a stop that also has a bend in it. (You'd want both hands available for steering). Or you want to change the volume/radio station...
Etc.