Hello! I really like your shader! I noticed some little things that may be important to you as a shader developer. One of them will be related with the shadows in the nether, and the other two will be related to working with other texturepacks.

Regarding shadows in the nether:
If you enable shadows in the shader, then instead of a small circle under the entities (vanilla shadows) realistic shadows will be displayed. That's right! But, if we are in nether with shadows turned on, then instead of shadows we will get a shadow circle under the entities. I know that there should be no shadows in the nether, but I believe that then there should not be a vanilla circle under the entities. What do you think?

Vanilla shadows (shader shadows disabled):

Shader shadows:

Shader shadows in nether:

Now, regarding the work of the shader with other texturepacks (I use Whimscape):
Will there be a setting in the future that allows you to turn transparent rain on/off? Some texture packs already perform this function and in combination with Miniature the rain becomes invisible.

Vanilla rain (shaders disabled):

Shader rain:

Also, will it be possible to expand the existing water settings? Certain water textures with some texture packs disappear when Miniature is enabled.

Vanilla water (shaders disabled):

Shader water (yes, I turned off reflections to show the difference), here you can see that the small white waves are almost invisible when the shader is enabled:

Thanks again for your wonderful shader. With it, Minecraft becomes unimaginably beautiful!

I forgot to say that when I show the texture display of the water, in the shader settings I set the following settings:
Minimum water texture = 10
Water opacity = 1.0