title: Custom module conditional configuration optons
body: <p>I would like to programmatically enable  or disable specific options for a custom module on the administration panel depending on the status of a select. For example, if I had a Yes/No select something like</p>
  
  <pre><code>do you want to handle stuffs? &lt; select yes/no &gt;
  </code></pre>
  
  <p>and if stuffs == yes, then a number of other configuration fields would be enabled/visible.  If stuffs != yes then those fields would be disabled/invisible. </p>
  
  <p>Is that possible to do programmatically via <code>system.xml</code>/some-other-means, or it is a sci-fi dream?</p>
  
  <p>Thanks for any help.</p>