Hi,
The next version of the plugin "attach serial" I would like to add more option in order to print more things than just the serial.
But it requires some quite important development time.
About the mail copy, it would depends on what you want to send.
You can modify the mail content thanks to HikaShop business and read a custom field in order to add the second email in recipients.
At the end of the email "order status notification", you can modify the email like this:
<?php
$data->customer = $customer;
$config =& hikashop_config();
$data->customer->user_email .= ',' . $config->get('payment_notification_email');
?>
(this example modification put the administrator in copy of every emails).
You can read a custom field instead and put it if the order status is confirmed or shipped.
Regards,