Yes, it's not always the case that a single URL is better in every respect. We're working on a design for associating multiple URLs with a story. Even with that, though, there still needs to be a primary URL, because the title on the front page has to link somewhere.
One thing we were stuck on for a while is how to let users vote on what the primary URL should be, but (fingers crossed) I now think we may have hit on a way to do it.
