» Tue Mar 08, 2011 10:48 pm
The wiki seems to suggest that the reason you can't turn it back on again (by the way, this is fairly easy to test; just turn it on, then save, then turn it off and try to turn it back on. If you wanted it on, just reload the save, and if you didn't, then no harm done) is that the game keeps tracking your basic necessities (food, water, sleep, etc) so they will run down (or build up, I guess, is more accurate) even if hardcoe is turned off, but it just doesn't matter if they do. Turning hardcoe back on at that point would kill you instantly.
I don't know if that's actually true, mind you, because it was written pre-release. If it is the reason, I think it's kind of a lame one anyway, to be honest, but it's also possibly fixable via mods. But the tl;dr version of this is that no, you can't turn it back on.