Need to disable bank 1 sensor 1 O2.

Which bit in ECU option do I need change to "zero" to achieve this?

 

AFAIK, we can disable rear O2 sensor for various purpose, but we can't disable front O2 sensor.
(some of the definitions have a table including a bit to disable REAR O2 sensor and patches for disabling DTC P0139, P0140.)

Because front O2 sensor is necessary for closed loop fuel control.
I think you should disable rear O2 sensor(and use the wire for your purpose) instead of front O2 sensor.