I so vote for this and reply & close topic to be included in the next stock release :x...
Since this didn't make it into stock 7.3, I attached an update to the first post.
If you had this hack implemented, please replace the /scripts/dorenamethreads.inc.php also.
The hack I posted in this topic to just rename the entire thread if you edit a the first post still works in 7.3.