Ugh, that really sucks. Thank you for being honest about it, and I'm glad you could recreate most of the data from emails. I liked Bugzilla, but it's kind of old and creaky, so most of the reason I like it is because it reminds me of early days LJ, which isn't a good reason.

It seems me like centralizing everything in GitHub makes sense. Does GitHub allow you to restrict who can report and edit bugs? Because I know the whole ethos of GitHub is to be very open and collaborative, but I would worry about having the bug-reporting system either deliberately trolled, or polluted by people who aren't aware of how our dev structure works, eg people who are frustrated with the Support system may try to use GitHub as a shortcut to get their pet issue worked on.