Index: t3lib/stddb/tables.php
===================================================================
--- t3lib/stddb/tables.php	(revision 8163)
+++ t3lib/stddb/tables.php	(working copy)
@@ -312,7 +312,7 @@
 		'cruser_id' => 'cruser_id',
 		'delete' => 'deleted',
 		'adminOnly' => 1,	// Only admin users can edit
-		'rootLevel' => 1,
+		'rootLevel' => 1, // 0: Can only exist in the page tree. 1: Can only exist in the root. -1: Can exist in both page tree and root.
 		'default_sortby' => 'ORDER BY admin, username',
 		'enablecolumns' => array(
 			'disabled' => 'disable',
Index: t3lib/class.t3lib_beuserauth.php
===================================================================
--- t3lib/class.t3lib_beuserauth.php	(revision 8163)
+++ t3lib/class.t3lib_beuserauth.php	(working copy)
@@ -148,6 +148,11 @@
 	 * @return	void
 	 */
 	function start() {
+		global $TCA;
+		if ($TCA[$this->user_table]['ctrl']['rootLevel'] != 1) {
+			$this->enablecolumns['rootLevel'] = 0;
+			$this->checkPid = FALSE;
+		} 
 		$securityLevel = trim($GLOBALS['TYPO3_CONF_VARS']['BE']['loginSecurityLevel']);
 		$this->security_level = $securityLevel ? $securityLevel : 'superchallenged';