Everyone has thrown in their two cents, I suppose it's my turn.
Cannibalism: Like it. Although I think it should only be available through a perk. That being said, People who use this perk should get a bonus of some sort when eating other people.
Craft Torch: I personally have never crafted a torch, So i don't know how useful these things even are. I'll leave this one alone.
Interactions: Not sure what exactly you meant by this, Characters can use the "animations" to lay down and have sex? Interesting idea, Although I don't see this getting implemented.
Corpse Moving: I'm indifferent to this idea, It sounds like an interesting concept though.
Melee Guns: This I thought was an excellent idea,I don't know how "limited" you would want to make damage though. Nerfing it too much would make trying it not worth most players time.
Overdose: Love it. 'Nuff said.
Junky: Like the idea, Dislike the name. Not sure if you knew, But alot of the time when someone is referred to as a "Junkie" It means they are a drug addict.
Riot Shields: Like it, Probably would need to be nerfed a bit though.
Stunning Weapons: Awesome! Is it possible to enslave other players? Because this would be perfect.
Radz: Considering it is two hundred years after the bombs have dropped, There really shouldn't be all that much radiation, If any at all. That being said, IF you were to hit radiation, It should have very adverse affects.
Robot Crafting: Like it. But it should extremely difficult to do.
Cybernetic enhancements: Not sure how I feel about this one, But being an "unarmed" character, I feel this could have some nice advantages.
Drinks: Probably should be called "Chemist", But a good idea none the less.
Tame animals: This would be pretty cool, As long as the types of animals you can tame is limited. I would really rather not see anyone running around with Deathclaws or something.
Irradiated weapons: As I said before, Radiation really should not be around.
I'll stop there, I only have a few more hours until I %100 New Vegas, I would like to get done sometime today
Great suggestions though!