Seems complicated. Doesn't selecting, then drag-and-drop do what the author wants?

This is assuming you a) have a mouse, and b) want to use it. Some people are keyboard-oriented, and find the mouse too slow and/or inaccurate.

My first thought as well. drag-and-drop is also fantastically useful for data you cannot Cut (e.g., moving an email attachment from one draft message to another)