Folks have suggested this in the past, and I'd love to see it happen. We haven't had a chance to code this feature ourselves, but I also know that everyone will have a different specification for how this should work. All the data is in the database, it's just a matter of someone having the time or doing it for contract. Perhaps you could give a solid spec. of what you're looking for and post it in the bounty forum or see if you can collaborate w/ someone else?