Construct can show a list of folders?
Like this -> <img src="http://img26.imageshack.us/img26/8135/fold.jpg">?
There are major IDE updates planned for the next build (.99) there are some old threads that have mock ups. I would wait and see what that looks like considering the current IDE is about to undergo some major changes from what I under stand.
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There's a tree control object that's half done, it may or not make it into 1.0.
You can replicate the above - though you won't be able to show a tree structure - with the List object.