Your post prompted me to do a Google search [ eBay feedback (software, program,automatic) ], and what do you know, they do have many feedback programs. Wow!

I didn't bother to study them all. I did look at this one:
http://pages.ebay.com/help/sell/leave-feedback-for-buyer.html
"You can have Selling Manager Pro automatically leave positive Feedback for your buyers when they make an electronic payment."

Robert
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Joanne Woodward at poker table in "Big Deal at Dodge City"(1966) 8x10 color still showing Charles Bickford / John Qualen / Robert Middleton / Kevin McCarthy / Jason Robards (from left to right). The movie is better known as "A BIG HAND FOR THE LITTLE LADY."
http://www.antiquegamblingchips.com/StillsC_FemaleStars.htm