I have a couple of suggestions of things to be careful of, especially if you decide to make your request during the interview. The biggest is that you don't want to make it sound like your happiness on the program is entirely dependent on your location. It's one thing to want to work in certain locations over others because you are passionate about the area/specific job, it's something totally different if the interviewer thinks you would only be content working in a certain spot (or worse, that you're going to get there and leave if you're not in one of the spots you requested). I'm sure you've heard already that no requests are guaranteed; make sure the person you're requesting to knows you know this too (ie, if you say something like "I know no location requests can be guaranteed, but if at all possible, I would really love to work in this spot" that would be good, because you've acknowledged that there's a possibility your request will not be honored and it doesn't sound like you would quit if it doesn't work out).
The second is to be careful about assuming based on your interview questions what role you're going to get. For example, in my interview they asked me 5 or 6 questions about being a character performer and 2 or 3 about attractions, and none about merchandise; I ended up being accepted for merchandise. So, if they ask you lots of questions about being FSFB or BBB, don't say that you would be happiest working at MK near Fantasyland, at least not without making it clear that that's where you would want to be just for those roles (otherwise they might not realize you were only talking about it for BBB and FSFB, and you might get attractions and end up working It's A Small World!). I've heard about them asking which park you would prefer; it seems like your best bet for a blanket statement would be to say DHS, since most of your ideal locations across the roles are located there.
If you still wanted to try to list multiple locations for multiple roles, I'd say your best chance would be to say something like "I would most prefer to work in one of the four main parks in a location where I could contribute to a very highly-themed environment, such as at the '50s Prime Time, Sci-Fi Dine-In, or Cinderella's Royal Table for FSFB, or the Great Movie Ride for attractions." You could modify that to fit your needs. It's kind of a mouthful, but it expresses your desired work place in a way that is probably more Disney-y (and makes you seem like a better fit for the company than someone who wants to work somewhere because it's "the cooooooolest!", for example).
Wow, that's pretty long! I hope it helps a little!
