Index: _source/plugins/enterkey/plugin.js
===================================================================
--- _source/plugins/enterkey/plugin.js	(revision 3441)
+++ _source/plugins/enterkey/plugin.js	(working copy)
@@ -7,7 +7,7 @@
 {
 	CKEDITOR.plugins.add( 'enterkey',
 	{
-		requires : [ 'keystrokes' ],
+		requires : [ 'keystrokes', 'indent' ],
 
 		init : function( editor )
 		{
@@ -113,6 +113,13 @@
 		}
 		else
 		{
+
+			if ( isStartOfBlock && isEndOfBlock && previousBlock.is( 'li' ) )
+			{
+				editor.execCommand( 'outdent' );
+				return;
+			}
+
 			var newBlock;
 
 			if ( previousBlock )