The add menu contains at least one item. The search. So i cannot remove it completely at the moment. And the past has shown that i better don’t remove such menus anyways. It’s a possible place for addon developers. What i could do is to move it to somewhere else. But i haven’t found a good place yet. For that i would have to redo the tabs in the tool shelf. Which would need some internal rewrite.
As told, i haven’t really started development in the node editor. I also still think about possible improvements. Maybe i even leave this area as it is.
You could nevertheless put your suggestions into the tracker. That way they don’t sink in the forum. But i cannot promise anything. So much other things to do first … ^^