”Extract as A New List" is nice way to "divide and conqueror," but this is a static operation, which brings about a permanent change to the data structure. There is no convenient way provided so far for you to re-structure if you screwed up.

I am wondering if you can add a more dynamic and more versatile way for similar effects. You could call it "zooming." You specify a branch of the tree. Then you'll be shown the branch as if it was the whole tree, with other parts of the original tree hidden. The difference from the current "Extract as A New List" feature is that there is no permanent change to the data structure. If you know the Emacs text editor, you could look at it as the tree version of the function "narrow-to-region."

I see this mentioned in the tagging thread, and I too would like to see a "Saved Search" feature implemented. The usefulness of it is enhanced even more when the search condition can include zooming. Altogether, a "saved search" provides a certain "view" to your data.

The ideas above are based on the to-do management tool called ShadowPlan that I used to use on my Palm. It included a plethora of features for a tool that ran on a device with limited computing power in today's standards. The following link shows its manual in case you'd like to know more about it.

http://www.codejedi.com/shadowplan/shadow-current/manual/ReferenceGuide.htm