What is the proper place to alter $_findMethods? (CakePHP 1.3alpha)

Hi, I'm creating a custom find method in my AppModel: _findRandom. And I want it to be accessible to all models, as I understand, for this to be achieved I need "random" (as a string) to be present in a $_findMethods array. It is set in Model class, and I thought that I can append to it in beforeFind function in AppModel, however that did not work. Then I thought that perhaps I should try doing it in a constructor, but that resulted in a blank pages (no debug messages with debug level 2). So as a temporary solution I completely redefine $_findMethods in my AppModel, bellow is how my code looks now, but I was wondering if there's a better way to append to that array.

---

<?php

class AppModel extends Model {
    var $actsAs = array('Containable');

    var $_findMethods = array(
        'all' => true,
        'first' => true,
        'count' => true,
        'neighbors' => true,
        'list' => true,
        'threaded' => true,
        'random' => true
    );

    function _findRandom($state, $query, $results = array()) {
        if($state == 'before') {
            if(!isset($query['limit'])) {
                $query['limit'] = 1;
            }

            # First find all ids with current conditions
            $findOptions = $query;
            unset($findOptions['limit']);
            $findOptions['fields'] = a('id');
            $list = $this->find('list', $findOptions);

            # Select random id(s)
            $list = array_keys($list);
            $resArray = array();
            for($i = 0; $i < $query['limit']; $i++) {
                $id = mt_rand(0, count($list)-1);
                array_push($resArray, $list[$id]);
            }
            $list = $resArray;

            # Add to conditions
            $primaryKey = $this->alias . '.' . $this->primaryKey;
            $query['conditions'][$primaryKey] = $list;

            return $query;
        } else {
            if(empty($results[0])) {
                return false;
            }

            return $results;
        }
    }

}

?>

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