I did this a lot but mainly when the Title was something like "Help me, please" when it was immediately clear the Title wasn't helpful.
If there's a technical question in the Title to do what you want means first to compare every title with the content of the post to see if the Title applies and then (not always easy) you need to think of a new title.
It's far too much work to do for every post in busy forums
SP 2010 "FAQ" (mainly useful links):
http://wssv4faq.mindsharp.com/default.aspx
WSS3/MOSS FAQ (FAQ and Links)
http://wssv3faq.mindsharp.com/default.aspx
Both also have links to extensive book lists and to (free) on-line chapters