Na lang zoeken, eindelijk gevonden dat het de tinymce.module is die je moet aanpassen.

En meer bepaalt deze code:$buttons = array_merge($init['theme_advanced_buttons1'], $init['theme_advanced_buttons2'], $init['theme_advanced_buttons3']);
$init['theme_advanced_buttons1'] = array();
$init['theme_advanced_buttons2'] = array();
$init['theme_advanced_buttons3'] = array();

$row[] = array( array('cut', 'copy', 'paste', 'pasteword'), array('newdocument', 'save'), array('italic','bold', 'underline'), array('undo', 'redo'), array('link', 'unlink'), array('image', 'charmap'), array('code') );
$row[] = array( array('formatselect', 'fontselect', 'fontsizeselect'), array('justifyleft', 'justifycenter', 'justifyright', 'justifyfull'), array('numlist', 'bullist', 'indent', 'outdent') );