The Manual Overide option is a winner

This is how I do it now:
in plugins/content/jreviews.php
Line 106 - I add my custom field for my title tags.
$fieldCity = ' - ' . $CustomFields->field('jr_citytown',$listing,false,false);
$fieldProv = ' - ' . $CustomFields->field('jr_province',$listing,false,false);
Line 119 - I Modify default values for title
$title = Sanitize::stripAll($listing['Listing'],'title') . ' - ' . $listing['Category']['title'] . $fieldCity . $fieldProv;