Comment 4 for bug 768006

I've added ayatana-design as an affected project.

My rationale is this: the <super><shift># shortcut to open a new instance of the application is a part of the design of standard Unity, and is implemented there. It is not in Unity 2D.

Either there is a problem with the design, in which case it must surely apply to both Unity and Unity 2D together.
Or the design is sound, and the omission in Unity 2D is a bug rather than wishlist.