title: Unity change mirror parameter at runtime
body: <p>I haven't found a single mention anywhere of being able to change the &quot;mirror&quot; parameter in Mecanim's state. This is very odd. I need to change this parameter at run time. I've tried adding a script to the State itself and inheriting from 'StateMachineBehaviour' but still no option to change the mirror parameter.</p>
  <p>What are my options to change this parameter at runtime?</p>