Also would be interested to have heart rate, stress and other widgets as home screen. And it would be useful if the "Last Displayed" option would also respect those widgets. At the moment "Last Displayed" only works for steps, floors and intensity. When viewing heart rate or stress the screen will still go to time/date even if the home widget is defined as "Last Displayed".
This is still an issue with the latest 4.20 version. If the heart rate widget is displayed it resets to Time display regardless of the "Home Widget" selection (doesn't respect the "Last displayed" setting). Why can't this be changed ? Is there a significantly higher power usage when this widget is displayed or what could be the reason ?