Something like that isn't to hard to make in the GECK, just adding a few new variables and adjusting food/chems to change them. I don't know if Bethesda announced any plans about them doing it themselves, but sure enough once the GECK comes out you can expect a NV hardcoe like mode to be out shortly. For the moment implementing new variables and having food/chems effect them isn't much possible.
I hope Beth can add this by themselves, I don't know why they refuse to provide hardcroe mode like the one in NV in the first place, it's a very immersive mechanism.
I really don't understand why they don't have hardcoe mode when even vanilla NV has it!
"Survival" mode, A.K.A. bullet sponge mode, is not gonna cut it.
Actually isn't Survival mode: "Excessive Bullet Sponge with Gimped Chems and Food" mode?