IMHO the option of splitting out BW views is simply not realistic in terms of effectively managing room inventory. As it stands now, there are very view standard view rooms. Thus, there are really only a few realistic scenarios with respect to rooms:
1) Book a std. view room, receive a std. view room.
2) Book a std. view room, but receive a preferred (almost certainly non-BW view room) room--guest is happy!
3) Book a preferred room, get non-BW preferred room--guest may be unhappy, but guest gets room for which they paid for.
4) Book a preferred room, get a BW-view preferred room. Guest is happy.
Under the other scenario, they would need to actually manage the (relatively) few BW view rooms and open the possibility of a guest paying for BW view and not getting it as a result. I understand the sentiment here, and I am not sure I disagree with it, but I just don't think it is feasible or advisable