Scalextric SSD only allows for 6 car IDs but it would be goodif you could pre ID more cars and then when you are qualifying you can have different sessions but use the same time display so the additional drivers get added to the same timing screen so you see al lresults together.
The cars would need an ID alreay but you could tick a box when Car A with ID6 is finished and then there would be seperate times counted for Car B usig ID6 but witin he same session.
Then for example the top 6 could go into the A final with the next 6 into the B final etc..