That's how I read the rules, too, Hosfac, but I sent a PM to Metro for clarification. I believe exceptions have been made in situations when people have accidentally not added a trait when a sim ages up. I really like having the hot tub on the 2nd floor and I'm willing to live with a chunk of unusable space to have it that way, but if I can fix it without breaking the rules then I want to take advantage of it.
BREAKING NEWS: I just heard back from Metro and he confirmed that building cheats like moveObject on are allowed as they do not affect game play. WOOOT! Thank you for the clarification, Metro, and thank you for the info ILoveDolls!