title: jQuery UI Sortable failing when first and last disabled
body: <p>I have the following code:</p>
  
  <pre><code>jQuery("#wiggle-available, #wiggle-current" ).sortable({
          connectWith: ".wiggle-connect",
          items: 'li.sortable',
          placeholder: "ui-state-highlight"
  }).disableSelection();
  </code></pre>
  
  <p>So, basically I have 2 sortable lists, between which I can transfer items. The thing is that on my second list, I want to have the first and last items not draggable &amp; not sortable (they don't have the <code>sortable</code> class, so all good there).</p>
  
  <p>When the list is populated with 3+ items (the 2 fixed ones and one in between them), it works OK, but as soon as I remove that 1 item from the middle, I can't insert anything between the 2 left items, only at the end of the list.</p>
  
  <p>2 questions:
  1. Is it possible to have a hack that lets me insert items between 2 non-sortable items?
  2. Is it possible to disable the adding of items at the end of a list?</p>