There is a discussion thread for the rolling shutter project here on FM. Members can contribute to the database by contacting the OP.
Yeah, all of the Leica cameras have annoyingly slow e-shutter readout speeds. While the 60MP Sony sensor is very capable, this is one area where it's terrible. I'd much rather have seen Leica use the sensor in the a1/z8/z9 instead, but I'm sure there are rea$on$ they didn't. Possibly also technical reasons or access restrictions.