The z-values of elements lets you organize the elements in your plot, but I have always thought that layers (like in Photoshop) are easier to work with because you can see and manipulate each layer in a ‘Layers’ window.
I’m wondering if you can combine the z-values and the idea of layers in ForeUI. Please have a look at this PDF in which I explain the idea in more detail:
http://egholm51.dk/ForeUI/ForeUI_LayersWindow.pdf
