How about...
* The live images must properly support mounting and using a
persistent
storage overlay for the entire system and/or one for the /home
partition, if such an overlay or overlays have been correctly written
to
the medium from which the image is booted
Does that better encapsulate that we require the images to work
properly
wrt persistent overlay, but the tools can be fixed post-release?
+1. Maybe "USB live images", to be clear that CD images don't support
overlays?