You can activate debug mode (F1 > write dm > enter) then press numpad 0 and you can see every zombie "text" through walls, but it doesn't show triggers like buttons and doors
By turning them on with electricity you mean carrying a generator and wire? or just activating them when you see a...
Yesterday I was doing shotgun messiah (T5) and it took me a good while to complete it only to find that I was missing a yellow dot that I couldn't trigger (one of the fire pipe rooms), wasting about two hours (got a good steel axe lv 6 at least!)
or maybe a complete current quest command?