Ahh sorry I somehow thought that you are using a shader ;\)
And I meant vecSkill41 and not entSkill41 which does not exist...^^

I would recomment you to create a new material for each entity then (mtl_create).
For texture shifting you can set entity.u/v which is now meant to be used again, with A7.07

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com