tried this
updated the config.js file to:
/**
* @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.html or http://ckeditor.com/license
*/
CKEDITOR.editorConfig = function( config ) {
// Define changes to default configuration here. For example:
// config.language = 'fr';
// config.uiColor = '#AADC6E';
config.entermode = CKEDITOR.ENTER_BR};
is that correct - cos nothing appears to change with the CMS pages...?