I'm pretty sure I put this in the idea list, but I can see why it would be hard to implement (what if 2 questions have the same title? What would you use to link the Q&A otherwise?). It's not a big improvement considering a Q&A could be linked in the same way with the url code and Q&A's are user generated (don't have any kind've "official" feel).

Thanks to GrandMasterD for my sig!
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The ability to code link Q&A threads. So the same way
I don't know how hard this would be to code, but I think it'd be a good idea to get the feature used more frequently.