It is already, sort of, supported
There is something almost as good available. I wanted this column for myself as well, so I gave it a shot.
I added "Last modified" as a new custom column, of type Date.
When I'm editing the metadata for a book, if I go to the "Custom metadata" tab, I see, under my "Last Modified" field, two buttons one. One of which is "Set 'Last Modified' to today". That's as close as we'll get for now to what we're looking for.
It's not fully automatic, but it's just one more button click.
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