This is already a priority for us, but I can't promise a date yet. The Nightmare Mode system was originally built on the back of Hard Mode, which is why they share a lockout. It's a technical consequence of that fact, not a philosophical thing on our part.
Thank you sooooo much for responding on this one. Even if it takes a while to implement (which I hope doesn't happen) it is very nice to know that you are finally open to separating this, and very nice to see a response finally on the subject.