@season_x said:
I think Right - click menus are more important than toolbars and shortcut key.
Doug Olivier (formerly a Trimble employee) is working on a popup button matrix called GhostMenu:
There is a beta version available to test. https://app.ghost.menu/
It uses a keyboard shortcut to popup the GhostMenu.
(But I cobbled up a little script to insert a command for GhostMenu into the top of SketchUp's context menu.)