Question about setTexture on Material object

In the Material setTexture method you can supply the MapTo mode for example

Blender.Texture.MapTo.SPEC or Blender.Texture.MapTo.NOR

Is there a way to set that to negative or any of the other “Map To” modes to negative, just like you can with the ui?

Thanks.

Bumping this up, because I’m quite curious about an answer to this question myself.
I had a look at the problem, but both the negative and the positive MapTo modes return the same integer value. Is there perhaps some additional flag to set, or is it just not implemented (yet)?