Cakephp 2.4.4 extending ModelValidator?

Is there a way to extend the ModelValidator?

I know you can do things like this in the controllers:

    public $helpers = array(
        // Core Helpers
        'Session', 'Time',
        'Html' => array('className' => 'Utilities.HtmlExt'),
        'Paginator' => array('className' => 'Utilities.PaginatorExt'),
        'Form' => array('className' => 'Utilities.FormExt' ),
    );

Is there a way to do this with ModelValidator?
My goal is to catch the validation error messages, and the posted data which I can with the callback, afterValidate().
However, it doesn't give me the actual validation name (e.g. 'notEmpty', 'alphaNumeric'), or the particular settings for this validation rule.

If I can't extend/overload the class instance, can is there another way to grab the above information without having to look for the message in the settings?
I can't rely on the message , because it can change based on how the message failed. Example:

class EquipmentDetail extends AppModel
{

    public $validate = array(
        'mac_address' => array(
            'alphaNumeric'   => array(
                'rule'       => 'alphaNumeric',
                'required'   => true,
                'allowEmpty' => false,
                'message'    => 'This field is required, and only allows numbers and letters. (you may have a space at the end of the string).',
            ),
            'Rule_MacAddress' => array(
                'rule' => 'Rule_MacAddress',
                'required'   => true,
                'allowEmpty' => false,
                //'on'=> 'create',
//                'message'    => 'This must be a unique value, there may already be a record with this MAC address.',
            ),
        ),
    );

// ....

   
    public function Rule_MacAddress($check)
    {
        if(!isset($check['mac_address']))
        {
            return __('The MAC Address isn\'t set.');
        }
       
        $mac_address = $check['mac_address'];
        $mac_address = strtoupper(trim($mac_address));
       
        if($mac_address == 'TBD') return true;
       
        // check to make sure it's a mac address using the Extractor Behavior
        $type = $this->EX_discoverType($check['mac_address']);
        if($type != 'mac')
        {
            return __('The given MAC Address isn\'t detected as a valid MAC Address. (0-9, A-F, no : or -)');
        }
       
        // check to make sure it's unique
        if(!$exists = $this->findByMacAddress($mac_address))
        {
            return true;
        }
       
        return __('This must be a unique value, there may already be a record with this MAC Address.');
    }

}

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