Not sure about the skill shot, I didn't have the machine very long and I never really tried to get it down.
DE calls the ball saver "Freeze". Look for that in the adjustments menu. However, I'm not sure how good LW3's ball saver works. DE Star Wars has a ball saver, but it only kicks in if no points are scored at all. In SW, almost any ball launched from the shooter lane goes through R2-D2, which scores points. So the ball can launch, go through R2-D2, then go straight down the middle and you won't get a ball save. About the only way to see the ball save work in DE SW is to have the glass off, launch the ball, catch it, then drop it down the middle. In that case, the saver will kick in and launch another ball. And that is about the only way you'll ever see it.
The reason I bothered to detail all of that is because if LW3's ball saver works the same way, you'll probably never see it kick in because any shot you launch hits the stand up targets and scores points.
DE should have had their ball saver work off a timer like most games. Then it would have at least been worthwhile.