Si_14

That's great demo! I can implement it as windows program if somebody interested.

Introduction to Fitts's law https://youtu.be/E3gS9tjACwU

Windows has create GUI/UX style guide. https://docs.microsoft.com/en-us/windows/win32/uxguide/top-violations https://docs.microsoft.com/en-us/windows/win32/uxguide/how-to-design-desktop-ux

The industry greatest pie menu is in blender. Here is 30 seconds demonstration Interface Overview - Blender 2.80 Fundamentals. Main difference is that a hot keys not require special keys(like ctrl, alt, shift) to be held for activation while you in editing areas(not text entry). I think this makes a world of difference.