TYPO3 sys_category menu
<p>What's a good way to create a sys_category menu in TYPO3?</p>

<p><strong>I'd like to render an alphabetic list of all sys_categories that are children of a certain category.</strong> Passing it to a fluid template, of course. To build a menu of all categories and link them to their <code>sys_category.shortcut</code> pages.</p>

<p>I've experimented with the following approaches</p>

<p>(Ab)use the category menu from news:</p>

<pre><code>lib.category_nav = USER
lib.category_nav {
      userFunc = TYPO3\CMS\Extbase\Core\Bootstrap-&gt;run
      extensionName = News
      pluginName = Pi1
      vendorName = GeorgRinger
      switchableControllerActions {
        Category {
          1 = list
        }
      }
      settings &lt; plugin.tx_news.settings
      settings {
        startingpoint = 123
        categories = 456
        categoryConjunction = or
        includeSubCategories = 1
      }
      view =&lt; plugin.tx_news.view
}
</code></pre>

<p>Via TypoScript (must be wrong, no output)</p>

<pre><code>lib.category_nav2 = CONTENT
lib.category_nav2 {
    wrap = &lt;p class="categories"&gt;|&lt;/p&gt;
    table = sys_category
    select {
      orderBy = sys_category.title
    }
    renderObj = FLUIDTEMPLATE
    renderObj {
      file = {$customContentTemplatePath}/Category/List.html
    }
  }
</code></pre>

<p>Using News to display a list of sys_categories seems somewhat odd. 
What is a good approach?</p>