title: Adjust FlowDocumentReader's Scroll Increment When ViewingMode Set to Scroll?
body: <p>I'm displaying a FlowDocument in a FlowDocumentReader with the ViewingMode="Scroll". If I use the wheel on my mouse, the document scrolls very slowly. I'd like to increase the scroll step. </p>
  
  <ol>
  <li><p>I've tried to change the Scroll setting of my mouse in Control Panel, but that doesn't have any effect. I think that WPF ignores that setting for the FlowDocumentScrollViewer.</p></li>
  <li><p>I've added a Scroll event on the FlowDocument and FlowDocumentReader, but that doesn't fire when I use the mouse wheel.</p></li>
  <li><p>I've added a Loaded event on the FlowDocumentReader, got the ScrollViewer descendant, 
  found the ScrollBar ("PART_VerticalScrollBar") from the scroll viewer's template and adjusted the SmallChange &amp; LargeChange properties. That also didn't have any effect.</p></li>
  </ol>
  
  <p>Anyone have any ideas?</p>