And I am aware that I do not know what kind of programming effort that would need … Layer Groups seem to be peculiar thing, so it might be impractical.
Still, no harm in asking I hope.
One workaround that would work for a group containing any kind of layer would be to convert the group into a smart object.
Yes, and for multiply masked Adjustment Layers one can put them with the pixel Layers into Groups with a Blend Mode other than Pass Through.
So one can certainly work without the feature, but for some combinations of Pixel- and Adjustment Layers it might be convenient.
I second your request.