Forcing 'Enable Vertex Shader' On

Is there any way to force SL to un-gray the 'enable vertex shader' option? Maybe through editing a system file or something? It's grayed out for me, but I would like it on. I know that sometimes this is possible, because I had another game where this was grayed out, and couldn't see the nice water, but after entering a code and altering something, I was able to see the rippling water and it worked fine. I really want this for windlight, and being able to see the water wouldn't hurt either. Anyone know of a way?

Oh well..