it would be useful a debug function to dump all properties to disk (memory card) in order to test, to discover and to check them.
This could be implemented in two ways. THe first based upon a sigle session the 2d writing to disk many session with proper separator... In both cases session file could be uploaded on a pc to be analized.
It could be useful for digicIII cams (i've got a a650is), whose set of properties is mostly undiscovered.