When finding the hack for linking the "asked" part in question meta, I discovered that the links of commented / answered are set according to the request URL, and not the 'correct' q2a-URL.
@gidgreen: Why have you decided to do so?
I think it would be better to get the correct URL, i.e. something like:
qa_path_html(qa_q_request($postid, $questionTitle), null, qa_opt('site_url'), null, null);
To not let people share false URLs (even if canoncial might help a bit regarding seo stuff).