Hi,
1. That's a good point.
You can change the line:
$filters = array('a.order_user_id='.(int)hikashop_loadUser());
to:
$filters = array('a.order_user_id='.(int)hikashop_loadUser(),'a.order_type=\'sale\'');
in the file components/com_hikashop/views/order/view.html.php
We'll also add that on our end.
2. Yes, you can use a translation override to change the translation key PAYMENT_EMAIL_ADDRESS which is used there. We didn't want to set it to PayPal as we wanted to leave open the possibility to use it for another payment method.
www.hikashop.com/en/download/languages.html#modify