What I have been told by ms is that you can't have waitlists for those single nights consecutively. Although I do know some members have had waitlists for single nights, I can't say if it has been for single consecutive ones. But when I've tried, never had luck.
This is off our member site:
What you need to know about the wait list for Disney Vacation Club Resorts:
During the Home Resort Priority, you can only wait list at your Home Resort.
You can have up to two active wait list requests per Membership per Use Year.
Wait list requests for consecutive nights cannot be split into separate night-by-night requests.
Your request will remain on the wait list for up to 31 days before your requested check-in date. If you'd like to keep your name on the wait list beyond that time, contact Member Services at least 32 days prior to your requested check-in date.
There is no wait list available within seven days of your requested check-in date.
If your wait list request becomes available, Member Services will automatically confirm the reservation and mail a confirmation to you.
There is no need to contact Member Services once your request has been placed on the wait list.
All other wait list requests or previously confirmed reservations for comparable dates will be cancelled when a wait list request is confirmed. Additionally, you will not be contacted prior to a wait list request being confirmed and a confirmation letter being mailed to you.
As a courtesy to other Members, please contact Member Services if you no longer wish to be on the wait list.