Well it's working fine for me. One thing I thought would be nice. In the inventory editor you can see the item name but you can't see the name in the master item list. Think you could do something about that?
You're referring to the Description? It is in the list, and if you expand your window (either by dragging or maximizing it) you might be able to see it better, plus there should be a horizontal scrollbar at the bottom of the Master Item List.
But I see what you mean, maybe the tree window doesn't need to be quite so wide.