Sorry, that was misleading indeed - in a moment of enthusiasm i not only discovered my ZWave things via PaperUI, but also created channel-item links (and thus items implicitly), actually having disabled Simple Mode already when i installed openHABian (Kudos to @ThomDietrich 
) on a Raspberry PI3.
Nevertheless, i second having everything but basic configuration in files UNTIL PaperUI (or any other UI for that matter) offer more configuration possibilities for non-techie guys AND IT Pros all the same.