The larger adjustment range is a promised feature at some time in the future.
"And the following tests coming shortly after release:
Out of range testing - take the AF Micro adjustment value outside of the normal +/-20 range for problematic lenses.
Yes, I read that, too - that was the point of my question. When I read that, it suggests to me that the testing
will be capable of going beyond the normal range, but it does not indicate that it will be possible to actually set an in-camera AFMA outside the normal range. Do you think the latter would be possible without altering the firmware?
Looking at the plots you posted, I'd bet the shape of the curves would be pretty similar for a given lens, or perhaps class of lenses. So, given sufficient data on those lenses, if a curve is 'trending up but starting to approach a peak' between, say, +14 and +20, but hasn't peaked yet, the software will extrapolate the curve and report that you'd need a +23 adjustment, even though it didn't test +23. Alternatively, since the software can measure the time between initiating focus and focus lock each time, and also the direction, it could apply a 'manual focus' adjustment equal to one AFMA unit for values beyond 20, and measure the sharpness at those expanded settings, providing real data for the plots.
But, I think the only way an out-of-range adjustment could actually be applied and used when the camera isn't connected to FoCal would be a ML-type firmware hack. I'd be very interested to hear other opinions, or examples of other custom functions having their available parameters changed externally.