Private Message Threading?

I did a quick search and wasn't really able to find anything on this, but I was just wondering if there was any way I could change my private messaging to a threaded layout. If not, I would highly suggest adding this as site feature. I find the current system in use for private messages archaic with the replies to a private message automatically quoting the previous message. It would be great if we could just organize private messages into threads sorted by date of last private message and grouped by contact.