Please keep in mind that this information was valid during the previous cycle, I am not sure if anything has changed.
I was given transcript request forms from AADSAS for every school that I listed. On that form were instructions for both you and the registrar. My name, university, AADSAS ID, DENTPIN ID, and date of birth were filled out automatically.
The instructions for the applicant are:
"To assure prompt handling, complete the ADEA AADSAS Transcript Request Form. Print the form and submit it to your school’s Registrar.
As stated by Alpha, I would include 4 letters to maximize the likelihood of meeting the schools requirement. Personally, I had 2 science professors, an orthodontist, and a general dentist.
Again, as Alpha said, you could definitely include this. Some people claim that it is redundant (in that schools can see you had a high enough GPA to receive the award), but if you don't have many things to populate the section with, use what you can!