Lets not sweat the small stuff. The big problem is WTF happened to the number 2 engine. The inability to control number 1 would have caused handling difficulties (presumably) but frankly I'd rather the default was the darned thing continued to run, rather than add all sorts of knobs, whistles and microchips that might turn the darn thing off when you most need it.....
If needs be just stick a ruddy great red fireman's switch behind a glass panel on each nacelle, connected to a old fashioned valve......
