I have an RGB LED strip which has a separate “White” channel which ignores the brightness slider (so the slider only contains the RGB channels). It’d be nice if dragging the slider to zero didn’t turn off the light.
This is probably something which should be under a configuration option.
It looks like the code which does this is located in HASS UI; https://github.com/home-assistant/home-assistant-polymer/blob/98df34c0a88a1029d542cfaa6e32610f98fff75b/src/dialogs/more-info/controls/more-info-light.js#L209-L224