title: Multiple search with multiplefields by default
body: <p>So, there is a jqGrid, with declaration, smth like:</p>
  
  <pre><code>$("#grid").jqGrid({
  ...
  bunch of stuff
  ...
  ).searchGrid({ multipleSearch: true });
  </code></pre>
  
  <p>which is fine, when I click Search button, it brings me modal form with I guess first column and a dropdown of sopts: searchoptions: { sopt: ['eq', 'ne', 'cn']}.
  Now, i want to be able to display a couple of such fields by default not just one. I know I can add those later, by clicking Add, but I want to display them by default.</p>
  
  <p>Having toolbar search is not an option.</p>
  
  <p>Thanks in advance,</p>