hook_form_alter is possibly the most powerful Drupal hacker's tool ever!

For those who have the time to study this code - both of you - check this out.

I wanted to use the nodereview module but I needed to make a few extensions and alterations to the functionality.

Without changing a line of code in the nodereview.module, I can get it to:
1) use the node->body to store info (in this case a description of the reviewer). I used the content types admin function to change the description of the body field, but I think i could have done it in hook_node_info
2) stop nodereview from allowing an admin to enable reviews of reviews (illogical and might loop?), and stop reviews of the new node type I introduced: axis
3) use a new data type of axis in an external table instead of defining them for each node type, so replace the selection list created by nodereview with a new one taken dfropm the external table

There is more code inthe nodereview2h module than just hook_form_alter, but you can see from this function just how much I have been able to override in nodereview! Stunning. Drupal Rocks!

function nodereview2h_form_alter($form_id, &$form) {
  if ($form_id == 'nodereview_node_form') {
    $node_info = node_get_types('type', 'nodereview');
    $form['body'] = array(
      '#type' => 'textarea',
      '#title' => t($node_info->body_label),
      '#default_value' => $form['#node']->body,
      '#required' => TRUE,
      '#weight' => -10
    );
  }
  if ($form_id == 'nodereview_configure') {
    $form['nodereview']['types']['axis'] = array();
    $form['nodereview']['types']['nodereview'] = array();
  }
  if ($form_id == 'nodereview_configure_axes') {
    $temp = array(
      '#type' => 'fieldset',
      '#title' => t('review axes'),
      '#collapsible' => TRUE,
      '#collapsed' => FALSE,
      '#tree' => TRUE,
    );
    //using nodereview_axes.weight to store the nid of the related axis record
    //can't use aid=nid because aid is autoincremented
    $result = db_query("SELECT r.aid, n.title as tag, n.type , a.nid as weight
                        FROM {axis} a 
                        INNER JOIN {node} n
                          ON n.nid = a.nid
                        LEFT JOIN {nodereview_axes} r
                          ON a.nid = r.weight
                          AND r.node_type = '%s'
                        ORDER BY a.rating
                        ", $form['use']['node_type']['#value']);
    $axes = array();
    while ($record = db_fetch_object($result)) {
        $row = _nodereview_configure_axis($record);
        $row['use']['#default_value'] = ($record->aid > 0 );
        $row['weight']['#type'] = 'hidden';
        $row['weight']['#value'] = $row['weight']['#default_value'];
        $axes[] = $row;
    }  
    $temp += $axes;
    $form['axes'] = $temp;
  }
}