Good Mornin' wscott.
I'm not familiar with a Western Sawyer. It sounds like a fair idea to keep from having to remount a board or buy a separate piece of equipment. But, I wonder if it negates the possibility of mounting "drag backs" on the mill. Those trimmngs need to be removed from the mill as well as the board and it sounds like a lot of manual labor to me.
Now, not having seen one operate, I'm talking out of school. :-/