Add donation at time of subscription

Hi, we have both Membership Pro and JoomDonation installed. Our members have repeatedly asked us to provide the option to add a donation when the renew their subscription. The key for us is that we would need two separate transactions - donations go to one account in PayPal and Memberships to another. So, effectively, we would like to leverage the donation setup in JoomDonation (with gift letter/receipt, etc.) will offering the convenience of a single submit for our users.

I support this. I am not using the integrated portals at the moment because of this. All our payments are treated as offline at the moment, so many of the benefits of the system are lost. We just use a link to a web page dispalying Paypal buttons that include one for donations and top up payments.