Minor thing, but I don't like how the "visible to" and "editable by" fields are so available. I'd prefer if there was just two options, "Public", and "security". It would discourage people from making non-visible bugs unless there is a definite reason to.
Maybe the "Editable by" field could be useful as an anti-vandalism measure on rare occasion, but I would expect it to be restricted to "admins" or something.