Cannot override WavingGrass shader!

Hello!

I'm trying to override the waving grass terrain shader to make some modifications.
I downloaded the built in shader from Unity, and placed it into my project. I modified the shader to look red so I'd know it overrode correctly.

I've been unable to override it correctly

Any thoughts? Also, I feel like this method of overriding shaders for terrain-relating things is a bit odd... it would be very cool if we could plug in custom detail / tree shaders into the terrain, just like how we can plug custom terrain shaders into it.

Thanks!

Josh

 

Still haven't gotten overriding to work, it's quite frustrating!