You can slow down the speed of Far Far Away (or any title) by making the Title last longer. A title that is 10 seconds long will go by slower than the same title at 5 seconds long.
Another way to create custom titles is to create the title in Apple's Keynote app, and then export it as a QuickTime file that can be used in iMovie. Here is a sample of a title created in Keynote using a green background. I then imported to iMovie as a greenscreen clip
Finally, Apple's Motion app allows you to create custom titles. Motion is tightly integrated with Final Cut Pro X. It can be used to create movies that can be imported to iMovie, but if you have Final Cut Pro, you can create a custom title in Motion and then use it over and over again in FCPX and change parameters, insert text, etc.