All Dash 8s also use less than 100% torque for normal take-offs with automatic 10% uptrim triggered by the autofeather system. In case of reduced power it doesn't go to max TO power but to 10% more than whatever it was reduced to. (Something to do with Vmc I suppose.)
(And at least for the Dash 8-100 there is a "no uptrim" option which allows to use 100% torque for airports requiring maximum performance without the uptrim overboosting the engine. Never seen it in, just read about it.)