Add Environment doesn't save all the setting options

Using Drupal 6.17 and Faceted Search 6.x-1.0-beta2

While creating a new Environment, only the name, title and description gets saved to database. If the other required fields are deliberately left blank then error message is shown but if they are populated, their values are not saved.

After some debugging, I noticed that $env->settings has only three keys - title, ignore_status and types after form is submitted. And there's a code in module that checks for existence of a key before adding value to it

  foreach ($form_state['values'] as $key => $value) {
    if (isset($env->settings[$key])) {
      $env->settings[$key] = $value;
    }
  }

so other keys are simply skipped. There's a comment above this code that suggests the code should work since every setting will have a default value. But this doesn't really seem to be the case.