This is one of those "less is more" programs, where it does just one primary thing, and is useful in doing such. Like one person commented, copying and pasting from open windows doesn't provide a pasteable list (things are in odd order and multi-level lists are useless).
This keeps things sorted and allows numbering, and the ability to list just folders, just files, or both from within a single folder.
All it needs now are three final things (IMHO):
1. a very small help file in the about or help menus, just to give a brief explanation of how things work -- only about 6 sentences would cover it.
2. The ability to add recursive folder listings to the list, represented by either a tab or a specified number of spaces for each level.
3. Drag-and-drop of the specified folder into the window, for selection.
(It's hard to give a program that only does one basic thing, 5 stars for features, but add the recursive feature, drag&drop, and maybe the ability to log file sizes, and I'd have no choice but to give it fives across the board.