Best is to contact MS via phone, email, or chat, and have it put in your particular request, and then do not use the online request page (doing so could wipe out request made through MS). The request page in the online check-in system applies generally to all those staying at the resort, including cash guests.
A number of years back, the site used to show a lot of different requests that one could make and then, when a site “upgrade” was done, most were eliminated, to the point now that it is often pointless to use the online request page when checking in. Moroever, it can actually be ridiculous to do so at a number of the resorts, e.g., for Jambo you can request a high floor but all
DVC rooms are on the fifth floor (club level on 6th); at Kidani, you can request to be near an “elevator,“ but there are three elevator locations along each of the two wings and a near elevator request (without naming the particular elevator) can be met by putting you in any room in the building.