Sidearm controllers
Sampublius,
As you say [Airbus] sidearm controllers don't work that way but there are 'active sticks' out there that act like a physically linked pair of sidesticks. The new Gulfstream G500 and G600 will have them. Being new to the civil market there will be a cautious approach to them but I believe there will be increasing pressure for all sidesticks to be active.