I would like to submit the following, bearing in mind that I use it on 1/700 ship models:
The lowly, wooden toothpick! With the tip cut off one end, and moistened with your tongue, it can be used to pick up, and place, small PE items. Just put a dot of CA or white glue where you want the item to go, wet the toothpick, pick up the PE, and place. What I like most about this is that the toothpick is small enough to get just about anywhere without knocking other parts off.