Provide information on all participants in primary participant confirmation email.

I've posted this on the CiviCRM forum (http://forum.civicrm.org/index.php/topic,34991.0.html), but so far have had no response so wonder whether it is better raised as an issue:

The CiviEvent functionality has improved greatly, but the confirmation email sent to the primary participant who has registered several other participants needs improving. It lists the total payment due, but only the order for the primary participant. So, he or she may have booked three people with a total cost of £400, but their room is only £160. The latter shows, as does the total, but not the other rooms/resources booked. I know you can modify the mail templates, but have tried in vain to discover what variables/parameter are passed to it so I can make the change myself.