It's a basic feature of many forums, including locking your own thread.
I'd be fine with a one or a few times title changing.
Forum help is only necessary cause you have no choice but to use it for a lack of this forums features.
Assuming they ever do update this place, most of forum helps uses could be replaced with buttons like other forums have. Highlight could be a report button, rename thread could be up top, throw in a lock thread button,maybe delete post after like a week or something.