Pretty sure the w-item dup is a glitch, since in my mind, cheats are put into the game and require input (Up, up, down down, left, right, left, right for example) Codes are game shake/codebreaker stuff.
And glitches are things that work in your favor (or against in some cases) but they weren't intended to be in there. But i guess the chocobo thing is a cheat, And i abuse the hell out of that!
Wonder how many if any were fixed in the PC version..