Shader Fusion (Detail-map, how to)

This is a source for answers about Unity. Support for a Unity extension such as ShaderFusion will be hit-or-miss. I have no intention of teaching you how to use ShaderFusion or graph-based shader editors in general as that's not what UnityAnswers is for. For specific answers about that product, you should request further information from either the ShaderFusion blog or the person who made ShaderFusion.

I will answer this as more of a general "what sort of blending function should I use?" question. Detail maps are usually multiplied onto your diffuse map.: See the shader examples. The scaled multiplication you describe would be something like multiplying by (detailTex - 0.5) * 2.0. You might also consider lerping on the alpha of the detail texture to use that for opacity of your detail texture. You might also consider multiplying/adding your detail's rgb components separately and keeping the alpha of your diffuse untouched, but whatever blend function you use is really up to you.

I don't have ShaderFusion, but I would imagine to multiply, you would do something like create a texture node for your detail map, pass it to a uv1 node and then pass both of your textures' uv1 nodes into a multiply node, passing that into albedo.

To create a scaled multiplication as you describe, I imagine you would pass a Vector4 node of 0.5,0.5,0.5,0.0 to the B of a subtract node and the uv1 of your detail texture to the A of the subtract node and then pass the subtract node into the A of a multiply node and a number node of 2 to the B of the multiply node and then pass the multiply node into an addition node with the uv1 of your diffuse, passing the result into albedo.