I'm basically somewhat ecstatic about most of these - the test questions would be bending the rules a bit, so I'm going to have to check with a CM. Apparently its fine to do so if its essential and the community agrees soooo...
I'm personally fine with this being a "per user" thing, since it still solves the main issue (that its a pain to do.)
What I'd like to see as a minimum is what's essentially a queue for editing out a tag, and running it by time. There's certainly precedent for entirely automated tasks (smokey does this) and at this level, its not automating the tasks, only when they are applied. Of course, if we extend this to edits, either not applying the edits (and throwing them back into the queue) or diffing it, and letting the user know should be nice.
I don't want a retag all. I do still want to review the posts (there's a few tricky edge cases - like having no tags a human needs to deal with.).
Super nice to have? An unofficial review queue with delayed application. But that's beyond minimum