I added a new field for the Page page type to set a background image. Almoast every page has now its own background image, but the log-in screen has not. I want to edit some other fields as well.
But it seems that page isn't listed in the site tree. There is an ErrorPage I can't figure out when it's needed.
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The Security section is not in the SiteTree as its simply a controller which fakes' it as a page. You can theme it by making a Security.ss template (or Security_login.ss if you want to be specific).
Thanks for your help. Works just as you said :)