For those of you who have not played F:NV, hardcoe mode was the idea that your character had needs, (Almost like The Sims, but a bit different.) In hardcoe mode, you had to constantly watch your character's food and water intake, and how much sleep they were getting, in addition to the other things, such as radiation and limb damage.
If your character ran out of food or water, they would perish. If your character didn't get enough sleep, they would pass out on the spot.
The hardcoe mode revolutionized the gameplay, for the only game who had anything similar to it would be The Sims.
I wish Skyrim would have a hardcoe mode, even as a small DLC. I'd pay up to $10 for it. It made the role-playing experience for F:NV a lot easier and it would make Skyrim's role-playing that much easier as well.
Also, in addition to my wish (which unfortunately I will never see), I would be in high hopes that included with hardcoe mode, you could repair your weapons and armor. All it would take is a few ingots to repair your armor to maximum, like the good ol' days in Oblivion.
Oh well, I guess I'm just rambling on about things that will never take place. Still, I wish it were available. =(