sim_vehicle.py add parameters

I successfully start the simulator with:
cd ~/workspace/ardupilot/APMrover2 && …/Tools/autotest/sim_vehicle.py -A “–uartC=uart:/dev/ttyUSB0” --console --map

I want to set a parameter that is not listed by param show
param show IMU
SIM_IMU_POS_X 0.000000
SIM_IMU_POS_Y 0.000000
SIM_IMU_POS_Z 1.000000

i.e. to add RAW_IMU.zmag

How should I proceed?
Thank you