matriax It is not possible to set textures of Obj model inside the texture editor because we cannot tell the names of the textures and the extensions used in the obj models available online.
In another note, I'm studying the possiblity to load the obj as data instead of importing files, as you suggested last month.
Since loading OBJ models can cause a problem in certain websites that do not allow such extensions, (MIME types).
And also, the idea itself is interesting, Imagine a website full of models in which we only have to copy/paste text in order to have them in our games. That would be awesome.
I'm not experienced enough in these kind of stuff, but I'll try my best to implement it.
I did it with the individual meshes effects, who know, maybe I can pull it of with the Objs.