- description with markdown to add code, quotes etc
- badges (custom tags like 'bug', 'feature')
- state (open, in progress, close)
Possibility to comment the issue of course.
Possibility to reference another issue ("clone of #212" for example).
And a way to reference an issue from git like on github (and others) with # (#143) and some keywords to change state (#fix, #close).
I guess it would be ok with this, all basics for a tracker