paypal different return URLs per form

on the payment settings page
we can specify the email, currency, and the url after payment or cancel
I would prefer if this was included in the form, under payment options

on different forms I might want to send to a different url after payment, send to a different paypal account or use another currency

So I would just move the whole payment settings into payment options on the form setup page

Gideonwith a traditional paypal button I can send a description (product or otherwise) with the payment request. How would I do this with your form?