I use SH404SEF for SEO along with Joomla 1.5.18, Then do the above hack in the head.php page as shown and then comment out lines 100 through 113 in your SH404 component located here:
/components/com_sh404sef/meta_ext/com_content.php
*comment lines 100-113 as shown below.

/*default:
if ($view==’article’ && !empty($layout) && $layout == ‘form’) { // submit new article
$title[] = $sh_LANG[$shLangIso]['COM_SH404SEF_CREATE_NEW'];
if (!empty($sectionid)) {
$q = ‘SELECT id, title FROM #__sections WHERE id = ‘.$sectionid;
$database->setQuery($q);
if (shTranslateUrl($option, $shLangName)) // V 1.2.4.m
$sectionTitle = $database->loadObject( );
else $sectionTitle = $database->loadObject( false);
if ($sectionTitle) {
$title[] = $sectionTitle->title;
}
}
}*/

Cheers!
Lucent One