I still don't get it.
ACAL 0 is same as ACAL ALL, meaning to run autocal for all functions. It's fully equivalent to running just ACAL without any parameters.
Try to rephrase it, What are you trying to get as result? Zero calibration is executed by CAL 0 and 4W low-thermal short at the inputs , not ACAL 0. CAL 0 required to execute separately at front and rear terminals.
This function did not change external behavior in firmwares since Rev5. I tested myself on Rev5, Rev7, Rev8 and Rev9.