I have played title police on a few of our WPMUDEV posts where the title was on the order of "I was thinking about something with wordpress and..." This is a useless title and I was trying to encourage people to make their titles more useful. One of them had the nerve to ask me how.
That's when I discovered, we can't. There seems to be a short window when we can edit both the post and the title but once that window closes, we are cut off from editing either.
I would like to see the ability to edit the title for a longer period of time, or even a title police role where the title police can create more meaningful titles for posts. It is frustrating to be browsing posts and have to open them just to find out they don't interest you.