OP, I would respectfully caution you about trying to put 5 in a BC studio, even if you can get it.
My family of 4 stayed in one this past year (2 adults, 2 kids, 9 and 11) and it was TIGHT. The BC studios are very poorly-designed and laid out. The room is cramped to begin with, and once you fold all of the sleeping spaces out/down, there is nowhere to put the sofa cushions or coffee table except in the middle of the already-narrow walking spaces (there are multiple sets of legs under the bed which prevent you from putting them there), and there's barely enough room to tiptoe sideways between the Murphy bed and sofa bed. Not only that, but by the time you've moved the chairs and coffee table aside, your access to the little drawers in the Murphy bed cabinet, and/or the drawers in the coffee table, is totally blocked. In other words, using the 5 sleeping spaces immediately turns the rest of the room into an impassable and unusable jumble of furniture and cushions.
We are incredibly light packers (so we were able to live out of the packing cubes in our little suitcases, for which there was ample room in the entryway) and we don't mind stepping around each other, but our three-night stay at the Beach Club studios in our cramped, claustrophobic, nowhere-to-put-anything quarters was unpleasant (to me, "mess is stress") and disappointing. After checking out of the Beach Club, we spent two nights in a studio at the Polynesian, which felt like an airy gymnasium in comparison, with more space and storage than we knew what to do with and plenty of room to move even with everything folded out/down -- plus that second bathroom, which you won't find in any other DVC studio on property.
Obviously YMMV, but I'd urge you to consider the Polynesian for a group of the size and configuration you describe (e.g., a Polynesian studio is about 100SF larger than a Beach Club, Boardwalk or Boulder Ridge studio), if a studio is what you want. I know it will cost much more in terms of points, but the appreciable additional space, storage, second bathroom and convenient location/transportation do add a ton of value.