Not officially, but equipped weapons and wonder weapons have different chances of appearing depending on the situation.
Yes
NO
youtube
Hack/cheat
its to not cheat
The cheat does not exist
You can get it in the mystery box in Zombies.
Complete the campaign or cheat.
yes
Yes there are a few.
The never die cheat is not a cheat it is pure luck to get it, and it is only on nuketown.
From the Mystery Box.