Thank you for the response, but that is just for editing the title style, location tagging and volume level. It doesn't let you change the length the title stays on-screen. Currently, the title just stays up for the entire 4-minute clip.
I'd like to find a way to do this. After using iMovie (just got my iPad 4 days ago) and ReelDirector, I can say iMovie needs some serious updating to be any kind of feasible video editor / authoring solution.