I will pass your comment on as a feature request.
In the meantime, I found this free extension:
https://extensions.sketchup.com/extension/1779a590-1342-4e2f-abb2-c19f0747627e/curic-behavior
It only claims to work up to SketchUp 2018, but it still works in the latest version I have.
There is one oddity, at least on my Mac. The tools are not enabled until you go to Tools/Curic/Behaior, and choose Behavior always face camera, for example. Then that entry in the tool palette works ok.