I'd really like a [Date Tagged] field in MC which fills with the current date each time a file is tagged. For a number of my tagging and organizing workflows, there are multiple steps required. For example, I set tags on files and get them "in order" and then I come back and do RMCF on them to move them to the long-term storage location, and then often do some final cleanup and tagging on them after they've moved (most often, Update Tags from Library).
When I do the tagging, I'm often working from a View filtered to show only "new, untagged" files. But if I don't do the stuff all in one step, it is difficult to come back and find the files I already worked on because they're now filtered out of my working view.
It would be VERY convenient to be able to have a Smartlist auto-fill with any file which has been tagged within X number of hours/days/etc. With this, I could easily make a "to do" list for recently touched files which have been tagged, but not "completed". I tried using [Date Modified] but unfortunately, this only works for file types with embedded metadata (where tagging the files also "touches" the data files on disk). Where I need this the most is for Videos, which don't support embedded tags, and so the [Date Modified] stubbornly doesn't change when I do my tagging operations.
I can see this being handy for other issues as well. If you accidentally change tags on a wide swath of files, it would make it much easier to find them if you could search for [Date Tagged] is in the last 1 Hour and go back and fix them.
So... This seems like an easy fix. We track the last time a file was played, and other similar information, but there's no tracking of when the last tagging change to a file was done. What say you?