To date, when you change the title of something in Dolphin to correct misspelling, the permalink remains unchanged. Just about every cms or forum platform I've ever seen, also updates the permalink, and sends a 301 redirect to the new url when the old one is accessed.
This is the right way to do it. How about adding this to 7.1? It shouldn't be that difficult. We need the ability to edit forum titles, and every other title as part of this change.
This way, we won't go around with page titles that don't match the url.....Like this very post, for instance. For whatever argument you guys at Boonex can come up with against this, I would argue that correctly spelled keywords in urls are pretty important.
It require structural changes in almost every module, so we can't do it in D7.1.
It may not solve your issue but may offer some other possibilities.