How about getting the URL of the page, instead of the title. The advantage is that it's unique (pages can have duplicated titles). This PHP code in a hidden field did the trick for me in BreezingForms, I assume it'll work in RS Form too:
<?php $pageURL = 'http://'; $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]; return $pageURL ?>
From reading the RS Form instructions, it sounds like you should use //<code> instead of <?php ie
//<code>
$doc = JFactory::getDocument();
return $doc->getTitle();
//</code>
I assume anything within those tags is then filtered before the form is displayed so that it renders as php.
From your email response, it looks like it renders raw php as text.
