If we were to have the spacer sunken into the dynamic frame, it would add about 16 components for each sash. In the case of the new glass door it would add 80 sub-components just for 1 door. I think it would be quite heavy then, especially for the door.
I’ve got an idea though - What if there were a setting to expand the glass and the spacer all around into the frame, and you could then cut-out from the frame manually with push-pull. The cut-out would maintain it’s proportions, as long as you don’t change the dimensions of the door panel’s frame (or sash’s frame).