Sort by Tag

Is there any way to add a "Tag" column to the listing ... and allow it to be sortable?

I'll see what I can do.

In the new release I've added a 'Tagged only' filter.
It will just show the tagged threads (or articles in ungrouped mode).

Let me know if that works for you.

You can find the filter under the funnel.

The new release will be available within a few days.