Make emailing PDF and “option” based on country/customer

Had a thought. If we could have an option to NOT attached PDFs to an email from a select number of recipient countries that “might” address the issue. Whether it is instructions on how to edit the plugin to not attache PDF if country=”one” or “two” or “three”, etc.. The best way would be to have a check box when we create an invoice for a given recipient that we could say whether to attach a pdf to an email on a per recipient basis. Just some thoughts. We “anxiously” await your response.