@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.)