I have been searching the net for this as well with no luck
Or you could just unplug the pigtail that's on the neg (-) battery terminalcalogero - I just saw that there is a START / STOP ELIMINATOR device sold on 4D Tech website which you plug in (behind the diagnostic port) and which "remembers" your on/off setting for the Auto Start/Stop function. So with this device, you can turn off the function, and it will keep the function off (without you needing to disable it every time you restart the ignition). Cost is $99. Not as good a solution as a FORScan code, but it might work for you...
Here is the link (with "." replaced by "[dot]":
https://www[dot]4dtech[dot]com/start-stop-eliminator-ecosport/