Just figured it out how to do it!
For those ignorants like me here we go:
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Not sure how he did it, but Mike programmed several 1125 ECMs for XB use.
XB and 1125 share the same hardware and firmware, but with different parametrization.
Just marking this thread. Getting the courage and other projects out of the way first to do some datalog tuning this year.
Ok, so, I successfully installed a second O2 sensor and is working properly. Just add the sensor, add the pin to the ECM, and turn on the independent front cylinder closed loop and log front o2 settings in tunerpro.
Not too sure yet, only have about 15 miles on it. Also, it's a different ecm and tune than I had. One thing I did find out was the BUEOD DDFI3 ECM does not allow a second O2 sensor. So, I had to swap back to my EBR race ecm. Which I also had to figure out how to turn off the stupid speed based fan control.