Limiting housing commands to family lines makes sense, but those operate alot like clans as it is. Even comes with a news section (for those suitably epic family announcements, i guess?). That being said, i'm totally up for it, cause waiting for the house owner to get around to decorating your room is probably a pain in the neck, even if you write the room yourself. If you wanna make any sudden changes, you'd have to get a hold of that same owner every time... That being said: sudden changes to the room are prohibitive, and i'm okay with that because it probably keeps something on the back end from going haywire. I know its already been said 'no', im just throwing my opinion in to the grinder.
Editing room exits could get weird, but i'd like to be able to have both a (for example) trap door type up/down exit in my room desc and have a matching up/down exit saying the same. Right now i'm making do with a metalworking design stair that echoes the room description - also stairs, what a strange thing to have a pattern for... the request for that one must've been someone who is an avid stairs fan. ...a stair-master maybe?