All of them. I can hit shots at will until I absolutely need to:
TZ Piano or Slot machine when I need 1 more for LITZ
TZ Lock when Extra Ball is lit
TSPP any lock late in Alien Invasion
TSPP Krusty spinner during multiball
TSPP Light Otto when timer is under 5s
WOZ Ramp when Toto really needs me
Funhouse Trap door whenever its open
Scared Stiff Either ramp for Stiff-O-Meter
Scared Stiff extra ball spinner when lit