Differencial thrust with twin motors

Has anyone done a mod for using twin motors for thrust?  The application I would like to implement is on a boat with twin screws but I am not sure where to start.  I think it shouldn't be too difficult to modify code to drive the motors in unison when in auto mode.  I would like to maintain differential thrust capability in manual mode but it is not necessary in auto.  Perhaps someone has done this for a twin prop airplane?  It would be helpful to know where to look in the code to make a change like this. 

Thanks, Tom

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  • The motors are counter-rotating, otherwise I could just drive them off the same channel.

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