I agree this would be a great feature.
We host forums for small local moto-clubs and racings orgs...and moving an event post that may be of interest to random visitors who stumble onto the site from it's original location is simply not logical because the regular users flood the Admin with "what happened to..." emails and pm's.
The only other option is to copy and paste the top post and a URL to the rest of the original thread, so the visitor can see any replies and/or changes and updates....but it's labor intensive for the Admin when you have many dozens of active boards to keep up with.
