Hi Ichneumon,
I already ask this on GWX dev forum...as yours news skins are so great and have that alpha channel fixed and also thinking in these small problems for some ppl, then will be great if you make the default GWX skins also with the alpha channel fix. This way even the ppl that can't use SHeCmdr or can't use the skin pack at all also will have fixed alpha channel textures.
Forgive me if this is already on patch 1.03 (I'm not sure about).
Rubini.