Passengers don't need to move the seat forward. In fact they are safer with the seat all the way back.
The BK mount allows the seat to move forward, but only 2/3 - 1/2 normal....so for short drivers say, under 5'10", the FE needs to be mounted on the passenger side. For taller drivers, driver side mounting is perferable.
NOTE: Most drivers prefer a more forward position when tracking the car than on the street with a more upright position. This allows better line of sight and provides quicker steering response and better arm leverage. In addition, the steering wheel is usually tilted forward more to allow the hands and wrists to pass under the steering wheel and between the steering wheel and thighs as the Z06 does not have full <180 degree lock to lock steering.