title: dojo/dnd/autoscroll: how to hamper the squirrel-like autoscroll speed
body: <p>I'm using dnd on a 120px tall dgrid and it's nearly impossible to hit my drop target.  The default auto-scroll feature is too fast for this small grid.  Is there a way to set an acceleration value or correlate the scroll speed with the closeness to the grid edge?</p>
  
  <p>So far I've found dojo.dnd.autoscroll but those properties seem unrelated to scroll speed.</p>
  
  <p>One solution is to modified autoscroll.js directly by changing autoScrollNodes:</p>
  
  <pre><code>// injected acceleration logic
  if(ry &gt; 0 &amp;&amp; ry &lt; b.h){
      if(ry &lt; h){
          dy = -h * (1.0 - ry / h);
      }else if(ry &gt; b.h - h){
          dy = h * (1.0 - (b.h-ry) / h);
      }
      oldTop = n.scrollTop;
      n.scrollTop  = n.scrollTop  + dy;
  }
  </code></pre>