Using the mousewheel it's possible to pan/zoom/rotate the viewport:
- mousewheel up/down: pan
- OPTION + mousewheel up/down: zoom
- CMD + mousewheel up/down: rotate
What I'm missing here is the ability to also hold SHIFT, so that:
- SHIFT + OPTION + mousewheel up/down: zoom at fixed steps (50%, 75%, 100%, 150%, 200%, …)
- SHIFT + CMD + mousewheel up/down: rotate at fixed increments (0deg, 15deg, 30deg, …)
(This similar to how the move tool allows you to rotate a layer using fixed increments)
Additionally, is the shortcut to reset the viewport to no rotation / 100% zoom / centered?