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Well, yes I'm sorry, I was mistaken. I wrote that fast from memory and I did it wrong. You can export the Object-ID, Matirial-ID and Deph Channel in png but not the alpha channel and they are not transparent.
is not exactly what you ask for in number 3 but now its possible to export png alpha channel. Then you can open them in photoshop via imatge stacks and you will have the render, the alpha channel and some others if you want in layers.
doing photomontages is almost essential some type of wrapper material, like the one in V-ray, in order to project shadows on a surface that will be part of the original photograph.
I'm not sure if there is any way right now to make one, but I was not able to find it.