[QUESTION/REQUEST] Instancing improvements

Is there currently a way to use instancing only with the surfaces you have selected on the parent object?

It would be great if I could select faces and have an instance applied only to those faces, rather than everything in the object.

Also, I notice when I use instancing, that I create the first instance then apply these to a surface, the original instance is still lingering. I have tried deleting it afterwards to clean up the scene but the node turns red. It would be nice if you could set a flag to use the first instance as part of the instancing procedure.