Overzealous hijacking of the signup broadcast form

When signup_status hijacks the signup broadcast form, it just does this:

  // Overwrite the submit hook, in case the user selects a specific status.
  $form['#submit'] = array('signup_status_signup_broadcast_form_submit');

That would break anyone *else* trying to alter this form to do anything. A safer approach would be this:

  // Replace the default submit handler in case the user restricts by status.   
  foreach ($form['#submit'] as $key => $handler) {
    if ($handler == 'signup_broadcast_form_submit') {
      unset($form['#submit'][$key]);
      break;
    }
  }
  $form['#submit'][] = 'signup_status_signup_broadcast_form_submit';

That would still let other things alter this form and trigger other actions when it's submitted, while still preventing signup's default submit handler from being called.