AssetPostprocessor.assetImporter  

// Set the scale of all the imported models to "globalScaleModifier"
// and dont generate materials for the imported objects

class CustomImportSettings extends AssetPostprocessor {
var globalScaleModifier : float = 0.0028f;

function OnPreprocessModel() {
var importer : ModelImporter = assetImporter;
importer.globalScale = globalScaleModifier;
importer.generateMaterials = ModelImporterGenerateMaterials.None;

}
}