Web API deactivation using PHP

I don't see a function for limelm.pkey.deactivate in the LimeLM.php file. I'm not a PHP expert, but can you confirm that I could add the following function?

public static function Deactivate($act_id) { $post_data = array( 'method' => 'limelm.pkey.deactivate', 'act_id' => $act_id );

return self::PostRequest($post_data); }