A couple things. As for limiting the older threads, I'm not sure we can do that but if I'm not mistaken, it does already list the date of the thread so you would know just how old the info might be.
Second. We had to take the feature down as it was causing our servers to freeze with the load from constantly refreshing the list and with 7 million posts, that's a lot of data to refresh given our daily posting. We hope to have a solution for this shortly and revive as i think it was helpful as well.
Thanks for the input.