sosensible, this is not the same subject (pathfinder vs drag and drop behavior).
You should rather make another topic.
Also, the question doesn't make a lot of sense, the pathfinder only caculates one path between the source (the object that has the behavior) and a destination, it's already a one directional path.
You might want to post a new topic and give more informations as to what you're EXACTLY looking to make.