It would be nice to have the following implemented, so to behave similar to other ECADs:
Link multiple 3D models to one footprint (kicad bugs)
Visibility control of 3D shapes in footprint (kicad bugs)
and a related discussion at GH
https://github.com/KiCad/kicad-packages3D/issues/388
and some proposal at GH
opacity option (FR)
and kicad launchpad bugs
Add Opacity property for 3D models
