Removing the Pro Sites payment receipt attached PDF?

I'm using the, psts_payment_info filter to customize the Pro Sites payment receipt email. While my custom email receipt looks great now, the generated PDF that gets attached with isn't and so I'd simply like to remove it. Is there a way I can use my own functions.php file to remove the, pdf_receipt function within pro-sites.php file?

Or better yet, may I request a specific filter be added so that I can customize the, $payment_info content that gets applied to the PDF attachment!?