Index: branches/RC/core/kernel/kbase.php
===================================================================
diff -u -r11495 -r11661
--- branches/RC/core/kernel/kbase.php	(.../kbase.php)	(revision 11495)
+++ branches/RC/core/kernel/kbase.php	(.../kbase.php)	(revision 11661)
@@ -443,6 +443,11 @@
 	{
 		$allowed_modifiers = Array('required');
 
+		if ($this->Application->IsAdmin()) {
+			// can change upload dir on the fly (admin only!)
+			$allowed_modifiers[] = 'upload_dir';
+		}
+
 		if (!isset($field_modifiers)) {
 			$field_modifiers = $this->Application->GetVar('field_modifiers');
 			if (!$field_modifiers) {