The scrbook class calculates margins automatically. For the title page of a book, I would like no margins at all, so that the text would be centered properly.
How can I disable all margins for the title page, and then reactivate them for the inside of the book?

\maketitlemacro – Koma script recommends (correctly) that a book cover resides in a separate document. – Konrad Rudolph Aug 12 '11 at 15:52