Including the shaders could be useful only for certain projects and people who do know the shader code.
If anything what 'm really would like to see is a visual shader editor something similar to what Dark Shader was or what we had in FPSC X10 so we could tweak certain shaders with sliders.
Could have some generic type of shaders included like glass, metal, plastic, ice, disolve..etc and tweak their properties in a GUI like reflection, speed, size, refraction, textures..etc
I would not even mind if it would be a DLC for AGKS but would be nice to be something integrated that we can use with the asset manager. Select a shader from the asset manager, tweak it in the properties panel and see the result immediately in the preview then save it or "save as" a new shader.
Maybe TGC could implement something in the IDE to allow people to expose properties from the shader code to the IDE that we can tweak without touching the code.
So we could continue to buy shaders made by @janbo and others then tweak it in AGKS in case the propertis have been exposed for us.
Then we would definitely see more and more shiny games coming from AGKS developers that would indeed attract more eyes for sure.