<p>It's impossible right now, but you can at least mention a tag in an answer: <code>[tag:X]</code> (becomes <a href="https://stats.stackexchange.com/questions/tagged/x" class="post-tag" title="show questions tagged &#39;x&#39;" rel="tag">x</a>). I think this cover the points you raised, but has no bearing on the engine inner workings, i.e. it won't show in the tag page itself, it's only a embellished link as far as I know.</p>

<p>It's useful in meta, but in the main not so much, because tags are volatile, and except the most popular ones, are highly susceptible to edits and even deletions.</p>
