In this thread "Leviton Z Wave Plus switches and dimmers are not updating when operated physically - #7 by jtp10181" I found that the "Generic Z-Wave Smart Switch" driver does report physical on/off events properly for the Leviton DZPA1-15A.
(P.S. For the "Flash" command, this Smart Switch driver reports the generated on/off events as "physical" instead of "digital", which seems wrong.)
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