Right now, it's possible to filter feature requests by tag.
We're using filtered reviews to do some backlog cleanup - as we look at each piece, I tag that piece with the date of the last review. I don't want to see that piece again for now. So I need to filter that tag out of the list.
But there is no way to say "display all of these requests except requests tagged [[TAG]]" making it very hard to keep track of how far we've gotten and what we've discussed.