there is no pack code as it is not endorsed by FTB (and I highly doubt it ever will be since FTB's philosophy is the exact opposite of Atlanticraft's). I personally don't like him since he's kinda mean to the person he's often seen playing with (and is overall just meh in the humor department), but people seem to enjoy him. That's not his normal personality so there's no worry that he's some kind of insane clown wearing a business suit. The psycho part you saw was a sort of alternate persona he's created called derp Ssundee.

A guy who is absurdly popular for his let's plays and willingness to find any way to cheat a give progression system.

In regards to the youtuber that mentioned, that is Ssundee. It would never make FTB's standards, but the joy of Minecraft is the ability to play however you want (there is no 'best' way to play).

I lost interest in Atlanticraft about two years ago now (mainly because they have a very bad habit of not following through with their promises and don't care to make their packs streamlined for weaker pcs), but to call the pack bad isn't fair. That said, if you want insane OP shenanigans with a metric butt-ton of whacky adventures, a stupidly broken boss fight that can lag your game to the point of wanting to tear your hair out (while still lending itself to a sort of team oriented battle), and just over all weirdness, then it's actually awesome. Crazy Craft is highly unbalanced (a great deal of dupe bugs exist, some intentional), is terribly inefficient in regards to memory usage and is often made without any care for long term progression (or for that matter aesthetics).

Crazy craft 3.0 mods