In the airlines I use most often they allocate seating in advance. 24hrs before the flight you check in and print the boarding card. You also have the chance to change the allocated seating if you so wish. It is most common that all the pax on a common booking have been seated together. It's called common sense. However, those who wish to be in the smoking section can relocate their seats before printing. What's so difficult. Have RYR not yet entered the pax controlling era?