Dual Yokes and Pedals

When you have a Pilot and Co-pilot, how do you get X-plane to allow two yokes and two sets of pedals to be used?

When assigning the axes under the "Joystick and Equipment" section, it doesn't seem possible to assign two yokes to the "Roll". Assigning one deselects the other assignation. 

Same story for rudder pedals and toe brakes.

This is simple to do in FSX where the last movement on either control takes the focus. 

Can anyone suggest how I can do this in X-Plane 10.25?

The obvious answer is to use a second PC configured as a co-pilot's Station. The trouble with this is then the cockpit would then not work easily in FSX.