These assets should make life easier for substance painter users, heres what it does:
It contains a shader called pbr-metal-rough-with-alpha-blending-no-metal, what this does is it inverts the metallic channel you see in substance painter, and it caps the metallic and opacity at 255, so you work with the same scale you do in game where 0-255 is the range of values for opacity and metallic so it more accurately reflects those values.
The other thing it does is it includes a relatively accurate skin mat that you can add your own normal, mask, and diffuse to with skin colour influence, I recommend using the asm-metal-rough shader for the skin when using this but it looks good enough for general usage to see what your material looks like against skin.
To install just download the folder and extract the contents to Documents\Adobe\Adobe Substance 3D Painter\assets