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Hi Renoki, thanks for buying the tool!
You can't assign different materials to the one mesh, I'll take a look and see how difficult it'd be to implement.

Lighting will affect the meshes you make if you assign a material/shader that accepts lighting. By default, the shader used it unlit so you would have to switch it with a lit shader.

There's no formal documentation yet, but a short guide can be found in the zipped folder you downloaded.

Hope that helps!