Customizable sorting behaviour

I was thinking that it might be nice to be able to sort feeds by a few different criteria, such as number of new items, time since last unread update (as opposed to time since last update) and a simple alphabetical listing. I do see the draw in having just a single behaviour and keeping it simple, but I find that sorting by last update tends to keep certain high-volume feeds near the top of the list all the time, which can be annoying. Any thoughts on this?