Correct me if I\'m wrong, but I thought that any DX8 card has some sort of Vertex Shader support. For less expensive cards, this is done in the drivers (by the cpu), but the support is there. I also thought the game already required DX8, thus using Vertex Shaders shouldn\'t knock anybody out unless they are on a really slow machine.
Also, if maximized compatibility is that big of a concern, perhaps body \"deforming\" can simply be an option. Stock hard animations can be included as well as VS enhanced meshes. If you can\'t run it, turn it off.