Thread:Extension talk:ConfirmEdit/addurl in USER NS does not work

My problem are spam links in the user namespace. I just spent quite a long time to find my configuration mistake, and in the end I realized that in the main NS my settings are working correctly (trigger on addurl), but not in the user NS. Even specifying $wgCaptchaTriggersOnNamespace[NS_USER]['addurl'] = true; doesn't show any effects... Why is this??? (And if intended, couldn't it be added ot the documentation in some obvious place...?

Edit: Actually, when the settings for user NS seem to be inversed from what I expect: $wgCaptchaTriggers['create']       = false; $wgCaptchaTriggers['addurl']       = true;

The captcha is displayed when I add a page with/without URL, while it is missing when I add a URL to an existing page.