Groups and Scenes - Group device --> possibility to choose a real device

I am using this to light up a control LED in my ALL Lights OFF button when there is a light left ON in the house.
I use a work around with "Simple Automation Rules" for cloning the group device to the control LED, but sometimes there is a different status between the control LED and group device.

This is the rule in "Simple Automation Rules"

If it was possible to choose a real device as group device there was no need to work with this work around --> no issues to clone a status...