By example. As you can see in this video everything seems working, but if I change to an animation where bones aren't near it's default transformation and move the light, then appear the problem (see head and legs), region attachments pixels are shaded as if the slots aren't rotated by the bone, being affected only by the skeleton transformation.

http://www.youtube.com/watch?v=lmoVfzz5P_E

Well I finally found a way to pass the proper information to each vertex, getting the desired light.

http://www.youtube.com/watch?v=PyfMK6QSaVA

I'm using the "tangent" vector from the Mesh object to pass the rotation and scale of each vertex to the shader. Then in the shader I create a rotation matrix with those values, and then I transform the normal with this matrix.

Still pendent making it works with multiple lights, seems something wrong in the material but not in the shader. DirectionalLights require a modification too.