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FM DebugMod 1.2.5v1 - Fixes problems with F3 debugging graphs, restores entity labels, and strips down debug info (updated 2012-04-04)
You can also check out the mod section to find some of these to improve the hardness level of survival. I believe their is a hunger mod, and some other mods you mentioned in your post.
It's nice that you used the word "literally" because if you hadn't done that, I would have thought that you figuratively found some. Thank you for making that clear.
i think there should be...
Dehydration..(find a water source)
Hunger..(Farm or Hunt)
Fatigue..(Use Bed to rest at any time)
More Monsters..(provides Greater challenges)
New Weapons and armour..(Advanced Weapons to defeat Special monsters)
Mounts..(Horses,Spiders,Dragon,Flying mount)
Bandit AI..(Steal Supplys From your Shelter)
Home Deffense..(idk)
Other Survivors AI..(Could be Friendly or Hostile)
New Ores..(more Goals)
IDK How to get my ideas to the creator of minecraft but i just hope he will make greater challenges for the games
http://www.minecraftforum.net/viewforum.php?f=1
Don't just make threads at the first section you see.
But yeah... hunger and dehydration would be nice.
Like others have suggested, check the mod section. Many are still outdated due to the update, but some have been.
God dammit.