CIRCLE WITH A DOT

@richlv @mattblaze all valid concerns. In the "pro" column I will add guests would have more recourses if the ice machine on their floor breaks

@mattblaze I suspect there is a square-root law here, where optimum balance between the "wandering guest" threat and the "found keycard" threat is achieved by allowing elevator access to the square root of the total number of floors (your own, plus some randomly selected floors)