Not entirely sure where to put this request. Will decals be coming to LWRP? (so we can do bullet holes, puddles etc)
This isn't the best place to get fast answers on that, as we don't handle that implementation, LWRP team does. You can try in the old Graphics Experimental Previews forum but I don't know that LWRP has their own specific area for user questions.
Ditto the request. My understanding is that Shadergraph should by default handle decals or textures with alpha but am looking for an example or tutorial.