The SAAB also has a split roll capability. From memory it was to allow roll control
in the event one control channel jammed. As with the ATR if both pilots elect to control the aircraft but want to go in different directions the control channels will separate and in the words of Frank Spencer "we both have contro!".
The same thing happened to a Hazelton SAAB going into Bathurst when it very nearly stalled and came close to hitting the ground. Both pilots attempted to control the aircraft with the inevitable results. From memory that incident only came to light because a high profile "ironman" pilot was sitting down the back and reported it.