I have called CRO in the past just to make sure a reservation is on there and they were able to let me know. If you really want a certain section of a resort, I would probably fax them your request about 5 days before your arrival, because from what I have heard from others, that is when they start assigning rooms, but then I have also heard that they start assigning at about 3 days out, but if you fax them a room request about 5 days out, you should be good....but like you said a request is only a request and there are no guarantees. Another thing you could do is when you check in and if for some reason you don't like where you are located, see if they have any availability in the area that you want.