Many writers complained that they did not like the fact that the title page was not centered. Our reasoning was that people will print and file their screenplays, so we have to leave more margin on the left. Users however wanted an option to center their title pages.
With Scrite version 0.5.4 beta, we allow users to center align their title pages. Just check the box on Settings -> Page Setup..
When you generate PDFs or pull a preview, you will notice that the title page will be centered.
Update / download the latest version to try out this feature.