One registry, one generated panel: every automatic behaviour declares a label and the sentence saying what it does, and the panel shows only what this player can actually do. Persistence is the host’s get/set adapter.
Press , or the sliders button under the band. The panel is
generated from VIDEO_SETTINGS and only offers rows for features this player has —
switch the host opt-ins below and watch Sound and Wind-down appear and vanish. Changes are live;
the store sees one write per setting per drag.