Allow new work requests to be made via email.
ie. sending a mail to 'support@domain.com' creates a new request
and sends back an email giving the raiser a support request number.
This would have to rely on the mail server somewhat as I think you'd
need a script running on the server to pipe mail through, sift out the
details and add the request.
phpSupport does this using a perl script.
Perhaps that could be co-opted to the cause. It's under GPL.