Anyone curious why the guy says Optifine is required for that mod, I think I figured it out. Since that mod allows such control over video graphics, the guy probably thinks you'd want to use that to disable things to lighten the load in combination with the intense shaders.
Unless you have a high end GPU like me anyway.
I don't want dynamic shadows until they're proper. From what I can tell, dynamic shadows in Minecraft depend on the sun/moon, which move with the player. I don't like that, so until there's some form of fix for this I'll stay away.
Or just not use it at all. I'm content with Minecraft without it.