In comments, [Bb]ug #?<N> should be parsed as T<N+2000>: that is, "bug 323" would be rendered as T2323; or converted to "bug 323 (T2323)". Ideally, the full bugzilla syntax would be parsed/converted, see https://bzr.mozilla.org/bugzilla/4.4/view/head:/Bugzilla/Template.pm#L234
Potentially incomplete proposal:
@chasemp: For sentences imported from Bugzilla tickets in comments like
- Bug 12345 has been marked as a duplicate of this bug. ***
(yes, those are three stars at the start of the line turned into a bullet point, meh, another cosmetic thingy)
I know that some folks like to look at duplicates because they might provide more information about a bug and clicking instead of manual copy and paste fiddling sounds easier...