How to change the default folders present in iteration plans

Hi,

By default an iteration plan shows "Top Items" and
"Defects & Enhancements" folders and I can add, remove
and structure other folders within an iteration plan.

If I always want particular folders in an iteration plan - is there a
way to get them to be there by default when I create new iteration
plans? So, can I configure the default folder structure for iteration
plans?

Thanks Johannes,

I've had a look at that - is there a way to duplicate an iteration
plan and have it associated with a new iteration?

I'm not quite sure I see when you would ever want to duplicate an
iteration plan - it ends up associated with the same iteration, has
the same work items, etc. It seems all you can do is change the name?
Am I missing something?