Not sure if it has been mentioned but you should add the show signature code in the showthread template as most would probably want it on/enabled rather then off.
Code:
<vb:if condition="$bbuserinfo['signature']">
<input type="hidden" name="signature" value="1"/>
</vb:if>
Also I personally replaced vbcms_page with:
Code:
{vb:stylevar htmldoctype}
<html xmlns="http://www.w3.org/1999/xhtml"<vb:if condition="$vboptions['enablefacebookconnect']"> xmlns:fb="http://www.facebook.com/2008/fbml"</vb:if> dir="{vb:stylevar textdirection}" lang="{vb:stylevar languagecode}" id="vbulletin_html">
<head>
{vb:raw headinclude}
<title>{vb:raw vboptions.bbtitle}</title>
{vb:raw headinclude_bottom}
<script type="text/javascript">
<!--
window.location = "/forums/"
//-->
</script>
</head>
<body>
{vb:raw header}
{vb:raw navbar}
<div id="pagetitle" class="pagetitle ui-bar-b">
<h1 class="pagetitle">{vb:rawphrase vbulletin_message}</h1>
</div>
<div data-role="content">
<div class="ui-body ui-body-e">{vb:rawphrase content_not_supported_by_mobile_style, {vb:link forumhome}}</div>
</div>
{vb:raw footer}
</body>
</html>
It redirects the users to /forums/ which is where my forums are.
EDIT: Another thought too, I would add "Top" links to the bottoms of pages as it can be useful in some scenarios.