- Add a display that shows the current positions of both control sticks. Add an alarm when the two sticks are not within a certain margin of the each other, if both are engaged. Such as if one is full forward & the other is full back.
This was my first thought as well. Confusion in one pilot was allowed to cause confusion in the second pilot, because he didn't realize that his partner was doing something unexpected and incorrect. If you make sure a pilot can always detect inconsistent reaction in a co-pilot, you can keep them in sync and prevent spreading confusion. An alarm when the two pilots are out of sync seems like a pretty straightforward benefit.
This was my first thought as well. Confusion in one pilot was allowed to cause confusion in the second pilot, because he didn't realize that his partner was doing something unexpected and incorrect. If you make sure a pilot can always detect inconsistent reaction in a co-pilot, you can keep them in sync and prevent spreading confusion. An alarm when the two pilots are out of sync seems like a pretty straightforward benefit.