Dont you thint this is totally unsafety to let unregistered users to makesimple DOS of your service by simple curl "https://compojoom.com/index.php?option=com_comment&task=queue.cron&format=raw&total=10000" WITHOUT ANY authorization ?
Could you please to make stand-alone CRON (class, extended JApplicationCli) that could be called from console by php ./path/to/site/com_comments/cron_job.php
?