Zoning on different layers

We would look to use zoning for more than one function.
An example being for playground surfacing, we would specify both the colour and the depth of surfacing and would look to illustrate this using the Zonify function on multiple different layers.

Is it possible or planned to enable the Zonify list to be selective and only list details within a single parent or sub layer rather than showing ALL zoning within the document?

Also,layer sub layers don’t show as such when selecting the required layer (they just show in a long, non alphabetical list). See below, having sublayers shown with their parents in the list would really help as we often use quite a detailed layering structure.