I preface these comments by saying that I have squat knowledge with racing sets....
I am going to skip the whole "major release vs oddball" part of this discussion and focus on the database and how it is and was set up. The purpose, to me anyway, of the database is to allow collectors to easily find and catalog cards in their collection and cards they would like to trade/trade for. The easier this is the better the database works. If a collector buys a box of cards at a yard sale he/she should have no problems using the filters etc.. to find a card they are unfamiliar with to catalog. Years ago I was one of those collectors and I happened to get a few of these cards in that shoe box. I could not for the life of me find them. I checked NNO, the number on the bottom right that has been discussed, filtered by the driver name etc... I had no clue and, not to sound pompous but I know my way around this database. I couldn't find it because I had no idea what number car the guy drove, and the image for that card had yet to be uploaded for me to just physically and visually scan that drivers checklist page. Tying the card# to the number of a car a person drove, when that number is not on the card is in my opinion counterproductive to the ease of cataloging that card.
Billy you are an expert in that particular sport/field. You know all these drivers and their history. Others do not. The work you have done to provide information on the driver/car history is immense and impressive, and when you did it fit the limitations of the database. For those that have not been around a long time there was a time that the database could not handle checklists with the same card# for more than one card in a checklist. Hence you will still on rare occasions stumble upon an old set that has the card#s NNO1, NNO2, NNO3 etc.. Or where the letters like 23a, 23b, 23c, etc are still visible on the card page. Billy set these sets up to work at the time for what the database could handle. The database has evolved. The proposals here to use the number in the lower right and move your work/data to note2 make sense from the standpoint of the collector finding a card in a shoe box scenario. Another view you have expressed is the team NNO sets that go by player uniform number displayed on the card....a view I understand and actually support. I see a number I filter by that number. But as Dan said a couple of pages ago this is not our site, but ADMINs and that is the way he would like the data displayed.
Nobody is attacking your character, knowledge, work ethic, or love for these cards. As a matter of fact your work has been complimented a few times in this thread. But before you throw your hands in the air and "give up" I would suggest you take the opportunity to help take your impressive work, and help adapt it to what the database has evolved into. I know the frustrations of having "work" changed here....I have been there. The Topps baseball buyback cards that were distributed in the 2010s is a perfect example of changing things to make things easier for the user. When they first came out the database could not handle duplicate card numbers. So working with ADMIN I came up with a numbering system that had the year-### as the card number. The checklist would be chronological and numerical. So Topps buyback from 1984 that was card number 45 would be 1984-45. A few months after setting this all up and creating the checklist the database evolved and multiple card numbers in a checklist were possible. All my work was not lost, but needed to be updated to fit the new abilities of the database. Was it hard work, yes, but it all comes down to the collector with a mystery shoe box of cards. 1984-45 is nowhere to be seen...but 45 is. So I have been there with what you are feeling/expressing....but if the data in the database does not evolve with the database's abilities it becomes lost....and a card in a shoe box won't be found.
EDIT: I should have added originally that those buyback sets have evolved to fit the database yet again. Nothing disappears but it just changes to fit current needs.