Casper's mom,
Obtaining an ADR for Rose & Crown will not gurantee you will see the fireworks from your table. Only a select few tables out on the patio will enable you to view Illuminations from your seat. I would recommend getting an ADR for about an hour and fifteen to an hour and a half before the start of Illuminations. You cannot request an outside table as part of your ADR, however, when you check in at the desk, you can ask to be seated outside for a fireworks view. You can even tell them you would be willling to wait for a table if neccessary. However, there is no gurantee that you will get such a table. The reason I am telling you this is that I dont' want you to have unreasonable expectations about what is possible. You are going during an "off" time, so your chances are better, but nothing is guranteed.
Even if you cant get an outside table, they do have a wonderful viewing area for patrons of the restuarant. You can go outside and view the show from the VIP area, and then go back to your table and finish your meal.