Required Concessions on the MLS??

Who doesn't enjoy a sold property?  It's gratifying, exciting, and rewarding to see all the parts come together.  These "parts" are intricate though.  Lending practices, buyers wanting a solid investment, sellers wanting to leave no money on the table and getitng the most out of their property.  Then there are home values going up and down..and down and down.   

I recently had an appraiser calling me about a sale from six months ago.  She wanted to know if there were any closing costs paid by the seller or any other concessions involved in this particular sale.  Six months ago, to me, feels like six years.  It's extremely doubtful I would have remembered all the intricate parts to the sale.  And if I did, I couldn't recite them at that particular time.  So I kindly said "I would love to help" - besides they're just doing their job right? - but "I don't have the file in front of me so can you please just email me your questions?"  Never did get that email.

Which leads me to my next question for all of you:  should there be a designated "concessions" field in the MLS forms?  Something that can be filled out voluntarily/involuntarily?  And if so, whom is the person to fill it out?  Listing agent or selling agent?  My vote is no concessions field.  Behind each closing are conglomerate of ways to make both buyer and seller happy.  If we should mandatory devulge this information, then are we protecting our client's confidentiality? 

I've once thought a CPA and a home Appraiser are similar.  Apparently it's one man's opinion in cyberspace that a CPA is a "numbers scientist" and a home appraiser is a "theorist" applying principals and formulas to a specific situation.  So if that's the case, then home appraisers could potentially theorize based on principals and formulas from the last six months of sold comparables?

Food for thought.  Thanks for reading!