Index: typo3/sysext/setup/mod/index.php
===================================================================
--- typo3/sysext/setup/mod/index.php	(revision 5527)
+++ typo3/sysext/setup/mod/index.php	(working copy)
@@ -149,6 +149,12 @@
 			if ($d['setValuesToDefault']) {
 					// If every value should be default
 				$BE_USER->resetUC();
+			} elseif ($d['clearSessionVars']) {
+				foreach ($BE_USER->uc as $key => $value) {
+					if (!isset($columns[$key])) {
+						unset ($BE_USER->uc[$key]);
+					}
+				}
 			} else {
 					// save all submitted values if they are no array (arrays are with table=be_users) and exists in $GLOBALS['TYPO3_USER_SETTINGS'][columns]
 				foreach($columns as $field => $config) {
@@ -310,7 +316,8 @@
 			t3lib_BEfunc::cshItem('_MOD_user_setup', 'reset', $BACK_PATH) . '
 			<input type="hidden" name="simUser" value="'.$this->simUser.'" />
 			<input type="submit" name="submit" value="'.$LANG->getLL('save').'" />
-			<input type="submit" name="data[setValuesToDefault]" value="'.$LANG->getLL('setToStandard').'" onclick="return confirm(\''.$LANG->getLL('setToStandardQuestion').'\');" />'
+			<input type="submit" name="data[setValuesToDefault]" value="'.$LANG->getLL('setToStandard').'" onclick="return confirm(\''.$LANG->getLL('setToStandardQuestion').'\');" />
+			<input type="submit" name="data[clearSessionVars]" value="'.$LANG->getLL('clearSessionVars').'" />'
 		);
 
 			// Notice
Index: typo3/sysext/setup/mod/locallang.xml
===================================================================
--- typo3/sysext/setup/mod/locallang.xml	(revision 5527)
+++ typo3/sysext/setup/mod/locallang.xml	(working copy)
@@ -84,6 +84,7 @@
 			<label index="disableCMlayers">Disable Popup Context Menus</label>
 			<label index="setToStandard">Reset all Values to default</label>
 			<label index="setToStandardQuestion">Are you sure you want to reset all values to default?</label>
+			<label index="clearSessionVars">Clear Session Data</label>
 			<label index="functions">Advanced functions</label>
 			<label index="copyLevels">&lt;b&gt;Recursive Copy:&lt;/b&gt; Enter the number of page&lt;br /&gt;sublevels to include, when a page is copied</label>
 			<label index="recursiveDelete">&lt;b&gt;Recursive Delete(!):&lt;/b&gt; Allow ALL subpages&lt;br /&gt;to be deleted when deleting a page</label>