Detail meshes lit despite having terrain lightmap

Hi,

i've come across a problem which the option mentioned here would solve i believe:

http://docs.unity3d.com/Documentation/Components/terrain-DetailMeshes.html
"Lightmap Factor" for detail meshes.
But i cant find it in Unity. Where can i find it, or how can i achieve this effect:

i want the terrain to have a lightmap(it has),
i want the rocks on the terrain (detail meshes) to be affected by *light*s
(they are not - like flat shaded, just inheriting the lightmap intensity).?

Another little thing: how can i enable the detail meshes to be able to cast shadows onto the terrain (for lightmapping)?

Thanks for every idea.