Quoted from o-din:IMO, any machine with a plunger has some kind of skill shot.
If I got to make the rules, hitting a shot with the flippers or some other technique other than plunger control is not a skill shot. No plunger, no skill shot. (And skill shot is almost half the game on bagatelles.)
That also topples plunger games like TOM, BK and SOF which have no options except "ball goes in play or ball doesn't go in play" on the plunger.
You might be able to argue that you can control the speed the ball travels coming off of the ramp from that plunge... But that is really a stretch.