Booking a Disney Resort on Travelocity

[CSchex]

Does anyone have experience booking a Disney Resort on Travelocity? We are doing a room only reservation, and Travelocity is about $110 cheaper. My only concern is that we are planning on staying at the Yacht Club, and I want to make sure everyone in our family can get into Storm Along Bay. If I list the children on the Travelocity reservation, they charge me the $35 per night price that Disney charges for an extra adult. I have read that you can reserve the room with 2 adults listed and add the children later. Is this correct? Any advice? Thank you!