I found out to easily add some more menu items to the {userbox}.
Define your own URL's in page_header.php, where the other URL's are defined. I.E.
"url_uebermich" => $site_sess->url(ROOT_PATH."de_uebermich.php"),
"url_diashows" => $site_sess->url(ROOT_PATH."diashows.php"),
"url_equipment" => $site_sess->url(ROOT_PATH."de_equipment.php")
Next step:
Edit in your Template Dir the files:
userlogininfo.html and userloginform.html
If you want that all your own links come up (whether your users are logged in or not)
add source like that:
» <a href="{url_uebermich}">Über mich</a><br />
» <a href="{url_equipment}">Equipment</a><br />
» <a href="{url_diashows}">Diashows</a><br />