In the turboprop world, this can be done by limiting torque to a value below what the engine is capable of producing. In some cases far below. The result is max power limitations due to torque on all but the hottest weather. It's satisfying to see max torque set (or just available) through 10000' without reaching temp limits.
A good example is the TPE 331 - 10 installed on Metro II's, using the -3 gearbox. No need to re-write the Flight Manual for performance, since no credit is given for the excess power available, but the benefits are evident on warm days or at altitude.