It could work both ways: either with one pilot in control or with both. The averaging thing was not as stupid as it sounds when values are close. It's complet

It could work both ways: either with one pilot in control or with both. The averaging thing was not as stupid as it sounds when values are close. It's completely crazy when both rudders were in the opposite direction at the maximum (average of -100,+100 = 0), but it must have seemed an impossible case to the designers...