I've said this before but...
When we were buying our DVC and we were hanging out in the lobby area chatting afterwards we wound up talking to several guides and various office people. We asked about adding a 5th person to our party occasionally.
They said that there was no official rule about the 5th person in a studio or 1BR. It was a suggestion for the guests comfort, and that there "are no DVC police walking around checking for a 5th guest"."
Now, they may have all been wrong but I believe that the spirit of the statement is true. If you are willing to be a bit crowded that's your choice Unless you are causing a problem, I doubt you are going to have a problem.
We were told the same thing. Now I am trying to book a 1 bedroom value at AKV and am told that I cannot do it. We are a party of 3 adults and 2 kids, which may sound like a lot, but the 3rd adult is my mom, and the children are ages 9 and just 3. So oldest DD and mom would sleep on the sofa bed and youngest will not sleep in a pack-n-play or a pull out chair, so either would sleep with us or in her toddler size blow up bed. So in this scenario, DVC says my mom cannot come, so that leaves my DD in the queen-size bed by herself, and my toddler still in the blow up bed or with us.