Can we change Z direction so that 2D renders Back to Front ?

I come from a Flash background where the player/engine could be set to render either "back to front" or "front to back". (speaking about the stock 2D here, not the Stage3D).

What this practically means is:

"Back to front": Every new display object created would have a Z order that placed it visually on top of any previously existing display objects.

"Front to back": This setting would simply reverse the rendering so that every new display object was Z ordered to appear behind previously created objects.

In Unity, in 2D mode, the Z axis points away from the camera, so every new GameObject appears behind the previously existing GameObjects. (Essentially, this is "Front to Back" rendering).

THE QUESTION: Is there a configuration somewhere that will make the render order in 2D mode be "back to front" ? I imagine I could explicitly set the sort order of new gameobjects when they are created, but if there is a global, simple way of reversing the order I would prefer it. Otherwise I'm having to track z order, etc.

Thanks.