Hello. I have tried the addon. It’s almost perfect.
The layer menu has all the needed options. And it makes a looot easy to paint in Blender.
However, it has an important issue who makes inusable for me.
When a new layer is created, the system creates a ‘diffuse bsdf’ node (you can see if you activate the node shader’s view).
Nowadays we use more the ‘principled bsdf’. It has more options. If you try to change it manually you can break the addon. Can’t this behaviour be changed? It’s only to replace the diffuse bsdf by principled bsdf. Just that.