With the "First Impressions" update, the new ^Orientation room gave new players a 'dorm key'. I was thinking, what if that card played a bigger role? What if there was a hallway outside the player's dorm that linked their dorm to Favorite Friends (up to like 10?) dorms, and you can use the dorm key to access those dorms.
The biggest thing to watch out for is making sure a player can feel safe in their dorm, so maybe give players the option to moderate who can enter their dorm using the dorm key. Such as, "Allow Favorites" and "Invite Only". Maybe even a doorbell system where it will ring whenever someone is trying to enter and you can "open the door" for them.