It is way to much work to find the Portrait / Landscape option for printing spreadsheets. We need a way to have this be top level.
Please take a minute and read this Introduction - Feature Request and what it states about where Feature Requests should go to.
You can write a macro and assign a macro or a button.
… and anyway, I cannot see how this is different from any other formatting of the sheet for print. It is conveniently and logically done in Format->Page. Moving it from there would be simply wrong.