Just had this idea:
How I see it: sometimes its much easier to create a thread then post a bug: it gives more visibility to the issue and it does not feel like it would be lost in the cloud of other bugs.
Therefore, to link them new thread type could be introduced: "bug"/"issue".
BTW I've seen several times already when bug description was pointing to this forum anyway. And threads are linked to issues quite often as well.
Don't know about feasibility though..