Layouts: explore search methods

[Antikyth]

Are there any search methods that can be used to make searching for (leaf) nodes on a tree more efficient?

One thing to note here is that windows have numerical IDs, and so theoretically could be sorted (though the tree itself can't have the order of nodes within groups changed - this would only be useful if there could be some kind of a flat, sorted list of windows mapped to their nodes in the tree).