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Yes, calibration may be very useful feature, especially because dongle itself has a number of internal spurious responses, the most prominent is harmonic of 28.8MHz clock.

Perhaps, it would be good to do couple of scans with dummy load, average and store store them and then subtract them from measurement data.

As for saturation. it is occurring at any gain setting - the display simply doesn't show much above -5~ 0dB... only below -5dB it follows the input level (dB for dB), that is why I concluded the osmocom lib takes into account only ADC value, and nothing else which is between antenna input and ADC.