title: Can the knockout throttle extender be changed after creation?
body: <p>I would like my throttle as a dynamic number that I can change at will, however it doesn't seem possible. Is this a limitation of the throttle extender?</p>
  
  <p>In my case I have a grid filter that I'm throttling. If I have only a few items in the grid, I would like a very low throttle. However if the grid row count gets very large I would like to change it (perhaps to a max of ~300ms). e.g.:</p>
  
  <pre><code>this.filter = ko.observable("").extend({ throttle: 1 });
  </code></pre>
  
  <p>then later I would like to do something like:</p>
  
  <pre><code>this.filter.extend.throttle = 300;
  </code></pre>