Import cubeMaps as a single DDS file

Is it possible to import cubeMaps not as 6 images, but as whole DDS cubeMap?

My problem is, that I need better mip-maps for my cubeMap. I can generate these with ATI's CubeMapGen tool, but I can not import them as single DDS file.

If I create 6 DDS files with correct mip-maps and then combine them in Unity, it looks like the mip-maps are recreated and wrong again. :(

No, this is not possible at the moment.

As of August 2014, this still seems to be unsupported.

As of 4.6.1, .DDS cubemaps work.