Input Actions allow customisation of how Commands are used with X-Plane hardware so that the response in the aircraft is as expected.
There is normally no need to apply an input action.
Input Actions Suitable For All Aircraft
ENGINE_REVERSER: Use this only for buttons on the TQ6 assigned to decrement thrust or activate engine reverse thrust. It ensures the event is repeated continuously.
ROTATE: Use on rotaries that support acceleration such as the EFIS and MCP PRO. The faster the rotary is turned, the more Commands are transmitted. Not all rotaries support acceleration so in those cases no benefit will be seen.
REPEAT: Repeat the Command until the button state changes. Ideal for use with engine reverse events.
NOTHING: Apply no input action.