I think you should be able to demolish a room that you no longer use. If someone made a room in a spot they didn't want or it didn't fit
within their budget, it would be very useful. Should able to do this at no extra cost (you lose the money you spent on building the room though) or
maybe even recover 25-50% of what you spent on it.
Being able to move you rooms around freely would be cool but it's probably a bit over the top cos that's very unrealistic and a little too convenient but it's an idea.