Most Turbo-Prop aircraft have an Auto Feather system that will feather the prop if torque falls below a certain figure with the power lever at Take-Off position. No need for pilot action, the prop will be feathered and engine will be shut down.
At least that's how I remember it for RR Dart, Allison 501 and Garrett 331.
PT6 might be a bit different as the prop is driven by a free turbine so the gas generator would still run.