Feature Request: allow us to designate layers within the stack that don't affect the stacking

[uxcourt]

In my group's shared symbol library, we've defined two layers which are meant to overlay on the other layers. We style them as opacity=0, then export them as overrides so that we can toggle the overlays on or off as needed.

We appreciate the facility for overrides to automatically scale the boundaries of a symbol. For this function to work, the only object at the surface layer of the symbol must be a stack group.

If we place the overlay layers outside the stack group, then we lose the ability for overlays to scale the boundaries of the symbol in the design files. If we place the overlay layers inside the group and make them invisible, then the overlays are not available in the design files. If we place the overlay layers inside the group and make them visible, then they stack the layout of objects.

What I'm requesting is to allow the designer to choose N number of layers within the stack group and exclude them from the stacking layout function. Alternately, the same need could be met by allowing objects outside the stack group at the top level of the symbol, but preserving the ability for override values to alter the bounds of the symbol in the design file.