So Aulani has 1 main set of doors per tower that are on either side of the lobby. So you would probably request a room closest to the elevators. I don't think that there are any that you would consider "better". If your goal in booking a pool view was to get closer, it won't matter. You will just be on the lower floors and have a slightly shorter elevator ride. If you want to avoid the elevator, you can ask for ground floor, but everyone still needs to go in and out of the same sets of doors. The ground floor rooms have a sliding door out to the walkway but you can not lock them from the outside. The resorts isn't really that big.
For tntstults, if you are renting points, the DVC member usually needs to call and make the room request. Member services won't talk to you and it is hit or miss if someone at the actual resort will pull up the reservation.