Yes. If there are any remaining applicants who have not been offered an IDT after the second iteration of offers has been made, then they will automatically be placed on a waiting list. If any further vacancies become available they will be offered to applicants on the waiting list in accordance with the published allocation process. When the supporting documents for the next IDT window are published, all remaining applicants will be automatically removed from the waiting list. If you still wish to be considered for an IDT at this point then you will need to reapply in the new window.
If you would like to know more about the Waiting List process please refer to the Trainee Guide to IDT.