I don't believe so.
You can book a Magical Grand Gathering. It will link your room reservations together, and it will give you a much better chance of having connecting or adjoining rooms, or at least they will be located very close together. As a Grand Gathering, you will also be able to book special and different experiences that aren't available to parties under 8, but... you don't have to book any of these specials.
They do guarantee connecting rooms for couples, when minors will be in the other room, but, for example... I have 5 children and we haven't been given connecting rooms on our last few trips because one or more of my children were over 18. We were given rooms right next to each other.