Currently in Blender 2.93, probably since blender 2.7... there's no precise way of rotating blender viewport like displayed in the screenshots... except for the keys Shift + Numpad 4 and Shift + Numpad 6
can anyone please help me out in adding a shortcut for this task, that should use Shift + Scroll Wheel ...?
I watched a video couple months back doing the same thing I need right now, but I cannot find that video now...
VIDEO of rotating using Shift + Numpad 4/8
Thank You for your Time