I think it's a good idea to improve a multiselection (radio option or other) for Move,Copy,Delete, etc nodes to a same destination (node).
Now it's only possible to Move,Copy,Delete, etc one node at time with long time to wait for moving/copying (subtree ) to the same destination or deleting nodes.

Ex

Node 10
----------Node 11 (with its sub-nodes)
----------Node 12 (with its sub-nodes)
----------Node 12 (with its sub-nodes)

I want to copy/move nodes 11-12-13 to another parent Node (15), I must do one to one

Maybe it's better and faster to select Node 11, select Node 12, select Node 13 and select a destination.

In admin interface when you click a node, you see its content (folders,articles, etc) and you can select it with a checkbox.........the only option (There's only one button) is "delete all"........maybe it's better to add more buttons (move,copy, etc) or add a select option menu (with options move,copy) and add a new button which validate selection.