Hi Michael,
Thanks for reaching out! I will try to help with your questions.
1) This is not something you can do through the plugin interface, but it is possible to create custom email templates. You would have to add any logic about who gets what using PHP. You can read more about customizing event templates in our Themer’s Guide.
2) There is a free extension for PDF tickets.
3) When using the PayPal checkout, you get taken to the Paypal site to complete the transaction. There is an option to have it redirect back to a page of your choosing on your site after the transaction is complete.
4) Both WooCommerce and Easy Digital Downloads are popular. We have support for both of these options in our tickets plugins.
Hope that helps! Let us know if you have any additional questions.
Thanks,
Sky