I'm really liking this tool so far. Also the fact that it'll support windows soon is great, since many people unfortunately use that.
Something which seems useful to me is a view sort of like exists in bugzilla. When I select a certain issue, for instance a bug, I get a window with these tabs:
Issue Details | Comments | Attachments | Changes history
A fifth tab, called something like overview or listview, which displays (chronologically) all the contents of the last three tabs combined would be very pratical.
That way, it's easy to quickly see what happened when you're catching up with a bug's progress.
Just a thought.