When sending a building request
Do you send the building numbers from the map on 1st post of this thread?
Also after you sending a fax.. Does disney contact you? Letting you know if it has been filled?
You can absolutely request room numbers, and do so from the maps at portorleans.org, Put a few on though in case they can't get you the specific one you want.
Disney MAY contact you, but just because they do not contact you does not mean they did not get to fulfill your requests, it just might mean that they are/were busy when booking your room and don't/didn't have time to send you an email. Many people here have heard, many people here have not heard but still had their requests filled.