This functionality actually used to exist but was disabled in an attempt to clean up the pages.
Might be worth thinking about re-enabling it in a somewhat hidden way (without visual clutter).
If you do ever return to the project, I would suggest re-implementing this with a dropdown to list the lower importance tags, such as what you’ve commented out in the file you linked
I think dorpdowns are a good low-clutter way of enabling more specific use cases.