title: How to override a default config option on Ext.form.Action.Submit?
body: <p>Is there a way to configure ExtJS (through an Ext.override?) so that submitEmptyText config option for <a href="http://dev.sencha.com/deploy/dev/docs/?class=Ext.form.Action.Submit" rel="noreferrer">Ext.form.Action.Submit</a> is false by default instead of true?</p>
  
  <p>I know it's possible to override methods on classes but i don't know about default config properties, one might think that since config options are mostly public properties that console logging Ext.form.Action.Submit.submitEmptyText would output false but it is undefined.</p>
  
  <p>One way I succeeded is by creating an interceptor for the run method but that basically renders the submitEmptyText config option useless since it can't be set anymore through a config object passed to the constructor.</p>
  
  <pre><code>Ext.form.Action.Submit.prototype.run = Ext.form.Action.Submit.prototype.run.createInterceptor(function() {
      this.options.submitEmptyText = false;
  });
  </code></pre>