One thing I’m missing, or haven’t found… Is a way to easily keep notes and document my hass-setup.
For example, add a note to my z-waveplug when the meter was last reseted, or a lamp was changed, or for that matter, when it was installed. Or just some notes of things tried, but didn’t work…
The best option(?) is to have an extra attribute named something like “notes”. So it is easily found 
you can already create custom attributes:
homeassistant:
customize:
switch.whatever:
notes: add some notes here
not sure if you can do it thru the UI tho.
of course, thanks for the reminder… completeley forgot about customize, at least som eons ago you, if my memory serves me right, you could do it through UI.
Just to hope that it one day will be easily available directly from the entity in the UI.
This would be very nice to have.