as far as i have noticed so far, the native materials that are attached to the object b4 the import don't convert into ArchiCad at all.
it creates the 'specular diffuse and ambient' values that the material requires, and associates to [General] (well for me any way)
Generally after converting a 3ds object into ArchiCad, i would place the object in the work space then 'Ctrl + Shift + O' to open the object.
Then redefine the 'labels' for materials and change the defaults to some thing that i would generally use. This helps tidy the object parameters up a lot.
PLUS a 3D preview
saves a lot of time if you can paste an image into that slot when browsing your library.
If by chance you do happen to find out how to use the native materials without going through a 'create new' process i would love to know.