You can edit the other rooms the same way you edit the bedroom, except you load the existing preset for those rooms, make your changes, save the preset with the same name as the original room, and then replace the original in vin_base/World.I don't see much more possible. I'd rather see the ability to edit living room, bathroom and kitchen. And actually eat in the kitchen, not the bedroom. I mean WTF? Who takes their meals to their bedroom to eat? And have everyone in the household eat then.
As for eating in the kitchen, I'm currently working on a mod that makes not only the rest of the house accessible, but also adds rooms to other buildings in the game as well to fill in gaps where rooms should be, like your own bedroom at the fraternity so you're not sleeping in the living room, or the boss's office at work for example. NPCs will randomly appear in some rooms during the appropriate times of day, so you may see NPCs living with you gather in the kitchen around dinner time for example. It'll be a while before I'm ready to release something though.