Sometimes you want to just switch between 2 orientations for i.e. conveyors, or avoid a certain direction when spinning it around. Since the turntable already has 4 sides with a "redstone dot", I suggest the ability to invert those, similar to the one of the big machines. Instead of changing it from active low to active high, the turntable would just spin in the opposite direction when receiving a redstone signal at this side.