Tinstaafl - that's my understanding as well.
Oktas8 - I'm not totally familiar with the DA42 but I believe you're describing the same system as Tinstaafl. Once above 800RPM (according to my propeller owners manual; it usually varies between 700-950RPM on most multi engine pistons) the start locks will be disengaged. When they are disengaged, you have nothing impeding the range from the low pitch stops all the way to feather. Basically, as long as you're above the start lock RPM, you will be able to feather the prop regardless of its current pitch - assuming normal operation of the prop and governor.