インスタンスがロードされた後、ツールバーのボタンを変更する必要があります。以下の例では、保存と新規ドキュメントのみを表示するようにボタンを変更する必要がありますが、そうではありません。
http://fiddle.tinymce.com/Hvcaab
<script type="text/javascript">
tinyMCE.init({
// General options
mode : "textareas",
theme : "advanced",
plugins : "pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template",
// Theme options
theme_advanced_buttons1 : "save,newdocument,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,styleselect,formatselect,fontselect,fontsizeselect",
theme_advanced_buttons2 : "cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote,|,undo,redo,|,link,unlink,anchor,image,cleanup,help,code,|,insertdate,inserttime,preview,|,forecolor,backcolor",
theme_advanced_buttons3 : "tablecontrols,|,hr,removeformat,visualaid,|,sub,sup,|,charmap,emotions,iespell,media,advhr,|,print,|,ltr,rtl,|,fullscreen",
theme_advanced_buttons4 : "insertlayer,moveforward,movebackward,absolute,|,styleprops,|,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,template,pagebreak",
theme_advanced_toolbar_location : "top",
theme_advanced_toolbar_align : "left",
theme_advanced_statusbar_location : "bottom",
theme_advanced_resizing : true
});
$(function(){
$('#testbutt').click(function(e){
console.log($('#testing').tinymce().theme.settings.theme_advanced_buttons1);
$('#testing').tinymce().theme.settings.theme_advanced_buttons1 = "save,newdocument";
console.log($('#testing').tinymce().theme.settings.theme_advanced_buttons1);
$('#testing').tinymce().execCommand("mceRepaint");
$('#testing').tinymce().render();
});
})
</script>
<input type="button" id="testbutt" value="test">
<form method="post" action="dump.php">
<textarea name="content" id="testing">
</textarea>
</form>