I think that could help improve the auto-normaliser as was
used in the original voxel editor

maybe with these new values, a better auto-normaliser can
be written

of course it would help 3ds import even more, as the
direction facing of some voxels in a voxel model are very
subjective, whereas when the model is made of polygons it
is unambiguous

and nothing will beat doing them by hand...

(note that I am careful not to promise to do the
normaliser.. but if anyone (Koen?) wants to talk about how
to do one, maybe my experiences with the first
auto-normaliser might be useful..?)