No, you can easily fly the decathlon at 1/4 throttle. The only thing you need to keep in mind is that if it gets very slow, and then you zip up the throttle, the sudden change in torque can bite you.

For example... If you're coming in on final, you're lined up with the runway, birds are singing and all is right with the world, you can just float her in like a feather.

But now, start that same scenario on the base leg... You're floating her in, you TURN to final, and the tail decides that it wants to keep turning after you stopped.

Or, on take off, as soon as the wing catches enough air to lift off, you let it. This can cause a torque roll. It is better to allow it to pick up just a little more speed than it needs before allowing it to lift off. And if a problem DOES occur, CHOP the throttle! Adding throttle will just increase the torque