Not that it addresses most of what you mentioned above, but I have tracked some of the icons in this thread (I agree it would be handy to have allllll the information available, including templates, icons, actions, etc). Information Request: Advanced Custom / Generic Device Creation (Icon Slugs, States, Commands, Actions)
It only comes up from time to time whenever I explore new features or new devices, but then I get really passionate for a couple weeks about “if only I had XYZ information, or if only I could make this one additional ABC thing function…”