Things like : "undo", "redo" last action, "copy", "cut"and "paste", "multiple page selection" via "mouse área dragging", all this within "Editor" graphical interface, can't be hitherto performed.
A "context menu" integration (through Windows), like "Open within PDF24 Editor", "Print with PDF24" and so on, wasn't implemented yet.
Of course, these things are merely some suggestions.