When you merge 2 threads together you end up with a thread that has more then 1 topictitle. Confusing, because the last-reply subject put on the main forum index.
Also when you move a post with it's reply's to a new topic, you often want to rename the topic. And sometimes, well, you want want to rename a topic. Get a spell error out, and get that spell error also out of the subjects in the reply.
This hack adds a menu option to the "manage topic" menu for mods and admins that renames an entire thread according to the subject of post #1 in that topic.
Enjoy! Or not
Whatever makes you happy