<p>There seems to be a lot packed into your question.  As far as the parts that consider changing the SE system, I suspect that is unlikely to occur.  Here are a few concrete suggestions regarding some of your points:  </p>

<ul>
<li>First, I would simply link to the prior thread at the beginning of your new question, with a short statement that your question is inspired by what happened there.  </li>
<li>With respect to having answerers and commenters there notified of your new question, the easiest way would be to leave a comment below such answers and ping the commenters by leaving another comment below theirs with @user____.  </li>
<li>As to learning more from a particular user, and finding all of their subsequent answers, etc., most of that can be done via their user page.  In particular, at the bottom there is a link for an RSS feed, so you can sign up to be notified of what they do on CV.  </li>
</ul>
