petitions aren't available via joomla frontend

when clicking the "sign" action for a petition, it does not redirect to the joomla frontend, and even if the url is reconstructed properly, it has permissioning problems.

in CRM/Campaign/Page/Dashboard.php
around line 161, we need to add: "'fe' => true"
to the petition sign array. that directs it to the frontend. but it still has permission issues. see:
http://joomla.demo.civicrm.org/index.php?option=com_civicrm&task=civicrm/petition/sign&sid=1&reset=1