The text in the templates is just static placeholder text on Windows at the moment, so you can create your own personal template and just set all that unchanging information (author name, address, etc.) in the template itself to save yourself re-entering it each time you create a new project. You can use the compile-time placeholders <$projecttitle> or <$compilegroup> in place of the “Project Title” in the title page or other document text to have that automatically replaced with either the project’s file name or the name of the Draft folder when you compile. (The Draft folder is for instance renamed “Manuscript” in the Novel template, but you can instead call it whatever your book is titled.) Text in the page header and footer in compile is static at the moment, so you’ll need to enter your name and so forth there as well, though again you can save compile settings as presets if you like, so you may want to set one up with your name just to give you starting point.
We are planning to simplify this for Scrivener in the future, so it should have a central location to apply some of these common project settings so you can make more use of placeholder tags in templates and compile.