During the import of different datasets the user can decide whether to overwrite the data of each property. Another option would be nice, which allows keeping the higher or lower value. It would also be good if it would be possible to import the data of a property for a molecule in case it isn't available in the other source(s) independent of the overall merging strategy.
Maximum / Minimum is already implemented. The "do not override" options is also aware undfined values. Thus, SH will fill missing values by this strategy.
Please re-open if i missed something.