SketchUp isn’t well-suited for use with a drawing tablet and stylus. It lacks some stylus-optimized shortcuts. I hope that someday there will be shortcuts (similar to those in Photoshop) for panning, orbiting, and zooming, such as ‘Spacebar + Click & Drag → Panning; Spacebar + Option + Click & Drag → Zooming; Spacebar + Shift + Click & Drag → Orbiting.’