How to change head title of a page having a Omega 4 subtheme?
Changing head title for a page in Omega 4 based on node id - same approach will work for any other content. (code below goes into template.php) 

Didn't test if this method supports described above HTML injection.

    function yourtheme_preprocess_html(&amp;$variables) {
        if ($node){
        $mynodeid = $node-&gt;nid;
// this will set "Custom Title" for a node with NID = 10
        if($mynodeid == 10) {
            $variables['head_title'] = t('Custom Title');
        }
      }
    }