Be able to send confirmation email when a quiz is completed

We have been using the quiz tool to create an application form for a conference. A lot of users who've filled out the form and successfully registered on the system expect an email to be sent to them confirming their place. This has happened despite a rather large note saying their place has been auto confirmed, once they'd completed the submission process. We run quite a few conferences a year (about 4 at the moment) with roughly 300 delegates attending each. So you can imagine we do get quite a few emails from delegates wondering where their confirmation email is and why it hasn't arrived. This is quite a drain on our admin time having to respond to these emails, so having a customised auto confirmation email option would be a great feature.