Coming in from the NW sector,performing a vor/ndb procedure for rwy 27L,it is possible to mistake and land on 27R(rwy's displaced)being 27R the closer one.Not to mention the final procedure leads you in on a angled approach.
There has been a few landings on 27R,having 27L as active,due to low vis/ceiling and MAP for non precision very close to runway...
Actually,you can takeoff/land from taxiways in various airports throughout Brazil,mostly on 1 runway fields.It depends on the PCN X ACN to limit that operation(max weight prob. 737/a320 limited).Landings and takeoff's from taxiways are a reality in aviation,take Ancorage for an example..low vis/poor crew CRM/awareness,workload...nothing that a proper "breifing" can avoid.
In a 3 man crew,if you have the middle jump seat guy"follow"trough..you have a extra set of eyes to help the operating crew,in any phase of flight.
Regards,be well
Spigot