It would be nice if we had the ability to add more windows and doors.  Also, It would be cool if we were able to add backsplash on the walls and set the thickness, height, and width.  It would also be nice if we could add outlets on walls to make sure it doesn't interfere with cabinetry.  Also, adding plumbing could be nice as well to make sure a sink would line up with your cabinets.  It doesn't have to even be super detailed.