Low end Minecraft Shader, that most anyone can run.
A: Once I rewrite my shader, which will be quite a while seeing as I'm currently very busy.
A1: There is a chance. I am still learning minecraft shaders and GLSL in general.
A2: If the feature is outside of the scope of not lowering fps (ie. anything Volumetric), then the answer is no.
A: Weird answer but, put the Shadow Map Resolution to 4096 from 1024.