HIGHLIGHT units digging in

[LEGXXIIPRPF]

I don´t know whether the option exists to highlight units that are digging in. 
I haven´t found such an option in the user interface.

It would be helpful esp. in large scale and huge FWWC and PzC scenarios in which a vast number of fixed and not fixed units is preparing positions. 
With the night arriving thery should be set back into inactivity/resting.