Your room key (KTTW Card) will show how many people are in each room and thus entitled to the credits associated with that room.
Room 1 - Will be able to use 3 adult entitlements at a time. (When dining at a signature restaurant they will take away 6 entitlements for 3 adults dining)
Room 2 - Will be able to use 2 adult entitlements at a time (same exception for signature dining)
Room 3 - Will only have QS credits and will be able to use them 2 at a time as well.
So what I think you are planning wouldn't work the way you want it to.