I created a tag for the purpose of tagging Thoughts that contain information about something I need to do as soon as possible (this is my !Now tag). I keep this tag pinned for quick access, but without a visual cue (on the pin) to let me know something is tagged, I have to remember to click the pin once-in-a-while to see if something is outstanding.
So my idea is to allow a tag to become pinned automatically once it is assigned to a Thought, and to be unpinned automatically when the tag is not assigned. Of course no one would want every assigned tag pinned, so there would need to be a way to enable/disable this feature per tag.
[Feature request posted here.]