Request for layer ordering plugin

[Yitzi Litt]

I would love to have a plugin that allows one to change the render order of layers in a given scene (map layers, parallax, battleback, GUI, etc.).
Potential benefits include being able to put parallax maps in between the map layers (thus not affecting, say, trees), having GUI be obscured by character sprite (for effect), among other things.
If someone knows how to do it, it would be greatly appreciated.
Thanks!