Simon Schneegan's "Kandu" cross platform pie menus, as well as his older "Fly-Pie" and "Gnome-Pie" projects, let you create and edit your own pie menus with a WYSIWYG drag-and-drop direct manipulation interface.

Kando: The Cross-Platform Pie Menu (github.com/kando-menu)

https://news.ycombinator.com/item?id=39206966

https://github.com/kando-menu/kando

A first glimpse at Kando's Menu Editor!

https://www.youtube.com/watch?v=rLJ1-z9i3cI

Development Update for Kando's Menu Editor!

https://www.youtube.com/watch?v=FIF6k9OxQ80

Item labels in Fly-Pie!

https://www.youtube.com/watch?v=Yyl5nMPI1f0

Fly-Pie 10: A new Clipboard Menu, proper touch support & much more!

https://www.youtube.com/watch?v=BGXtckqhEIk

Fly-Pie 7: GNOME Shell 40+ and a new WYSIWYG Menu Editor!

https://www.youtube.com/watch?v=sRT3O9-H5Xs

Gnome-Pie

https://vimeo.com/30618179

Gnome-Pie 0.4 (12 years ago)

https://vimeo.com/35385121

https://schneegans.github.io/gnome-pie