It would be so useful to have a zoom to: width of the frame/page. It’s one of the most used views for designing for wider screens.
And also, when zooming in to fine tune a detail, you want to zoom back to the previous one, alternating between them with the same shortcut - what about ALT-Z? instead of zoom out with click - less used.
Of course Figma would have to know the Working Frame context all the time so it wouldn’t zoom out to some any other frame/page.