There was a time when they allowed 5 in a studio routinely, I think this ended around 2001. What you're referring to are the dedicated studios at BWV with a day bed. At one time this was a separate booking category so it was possible to allow the extra person. Now those rooms are not a separate category, only a request, so no way to know if you'd get it or not and therefore, no way to target them for 5 people.