You can do it. I did it. Buyer can transfer it provided he has the QID no and mobile no of the buyer. Need to pay QAR 200 as transfer charge with a credit card (don't know it accepts any other mode of payment)
The buyer will get call from traffic for confirmation and the awesome part is they will deliver the 'istimara' at your place..! really commendable service from the authority. make use of that.. enjoy..!!