push control lets the motor still run the same rpm when you let off the gas. It is for a certain ammount of time. That time is set with push control. It is something like coasting when you let go of the throttle instead of slowing down emmediatly on the motor. It is there to prevent the emmediate braking on the motor when using very high fdr's/low rollout with a lot of timing. The higher the fdr / lower the rollout the heavier the motor resistance when letting go of the throttle.