We too had some problems with room assignment and the front desk at BCV. I posted our experience after we returned from a 10 night stay in June.
I do not think that any advantage should be given when booking at your home resort within the
DVC system other than the 11/7 month window features. I do think that similar, as some other folks have said and as was our understanding when we became involved with the DVC, that the 11 month window should be used in helping with specific requests. I too thought that the earlier you booked, guaranteed you a much better chance of receiving your requests. This is really important to us when booking a studio or 1 bedroom at HHI due to the fact that we wish to stay "out" in the stand alone units. So far we have been successful in doing this. Maybe it has been luck. I do understand that the dynamic or when folks check in and out ie., days of the week can make this a somewhat complicated issue but as far as I am concerned this is just one of the things that we all pay dues for....the system should be able to make it happen when at all possible.
I am sorry that you, at of all places--WDW, (OP) had your children spoken to in such a rude manner and were, IMHO, pretty much lied to by the BC front desk.
I really believe that the front desk of the DVC/WDW combo resort properties really do not understand what the DVC experience means to members. And many, just don't care. We have never had anything short of excellent treatment at HHI, Vero and OKW.
Specifically, to the BCV, I am convinced after staying there 2 different times for stays of 8 and 10 nights that their housekeeping organization can be very unresponsive. I do not think that it is the fault of the folks on the front line. I believe it is due to pooir management and with a system that allows for way too many breakdowns with the front desk. I know that these are generalizations but this resort has many folks come to these boards with similar experiences.
Lastly, the thing that drives me nuts as a DVC member is that I really have very little recourse, short of selling my interest, to receive some type of relief when I receive shoddy treatment. How would one receive any type of compensation when you are the one paying all of the salaries of the people involved. They would really be comping us with each others money.