Two things:
1. I have not tested this new version 10.0.3, but in the previous version, in 'Titles,' the first 16 you could not change anything, in the ones after the first 16 you can.
2. If I had a dollar for every time I wrote this, I could afford to buy Final Cut Pro:
"Apple DOES NOT monitor ANY of the forums. They never have, unlikely they ever will. The forums are entirely dependent on the contributions of countless volunteers around the world. Period."
If you have a bug report, I urge you strongly to go to the iMovie Feedback section (under 'iMovie' in the menubar), and file your report there. It is a small chance, very small, that Apple may take note. But it is 100% guaranteed that they won't notice what anyone writes in these forums.