Templated Event Handlers & Observe.List

I have a Can.Control that essentially functions as a list of items.  I'd like to listen to attribute changes made to individual items in this list.

The list is a Model.List, which is bound to my controller via list.options.items.

What's the best way to do this?  I can define a templated event handler using '{items} change' to listen to any change to any item in the list, but that seems awfully inefficient.  I also need to listen to attribute changes before the model is saved, so '{Item} updated' also doesn't work for me.  

Is it preferable to create a separate Can.Control for each list item, or is there some sort of alternative syntax (eg '{items} {Item} attribute') that would allow me to listen for changes to individual items in the list, rather than the entire list itself?

Thanks!