I used to have a Surface, and when I was using it with the keyboard the most common thing I'd do on the touchscreen was scrolling. You can extend your arm out a

I used to have a Surface, and when I was using it with the keyboard the most common thing I'd do on the touchscreen was scrolling. You can extend your arm out and rest your wrist off to the side, which puts your thumb in a nice spot to reach an inch or two at the bottom of the screen. I used pinch to zoom on the web as well. It's just nicer than weird key combos like ctrl-wheel, and your average user doesn't even know that exists. But I bet they know about pinch to zoom.