DRV8421BEVM: OCP and 50% duty

Tool/software:

hi team,

 customer aim to use DRV8421B to drive 2 BDC motor. but the 2 motor have different gear, so there would be one motor stop and another still running use case.

 the datasheet showing total motor on/off by EN pin, but there is also a comments said :Providing 50% duty cycle to IN1/IN2 tied together will stop the motor in DRV8421B Parallel Mode. To move forward, provide a duty cycle lower than 50%. To move reverse, provide a duty cycle higher than 50%.

 so my question is , whether we can input 50% to IN1/IN2 to stop the motor during EN still is enable.

and if the we use the DRV8421B at parallel Mode, so each channels have 2A OCP, then total would be 4A output capability?  and OCP at 4A?, How to achieve current sharing capability？