Weighting gnome canvas item?

[Linus Larsson <linus mediasvar se>]

Hello, I'm sitting here with a gnome canvas and putting lots of lots of 
canvasitems in it, several thousands.

My problem is that I only found gnome_canvas_item_raise_to_top() and the 
other functions to set which item to  be on top, bottom, raise, lower.

This just put the items lower or higher in a linked list right? What would 
be much easier for my application is if there where
some way to "weight" the items and then insert then based on the weight. 
Can this be done with standard gnome functions?