Well, I've successfully added uploading of attachments to tickets. You can even add additional attachments by updating the ticket. In addition to that, if you upload source code, it is viewable and it's syntax is even highlighted.
At the moment only HTML, PHP, CSS, Python, Perl, Ruby, Javascript and Pascal are supported, but I'm busy working on supporting more languages.
I've updated the demo for those who want to play around with it, and I'll release an egg file once I've done a little more testing and bug fixing.
