I've started trying ASM finally

[dragonboy269]

XD well, since nobody suggested a code, I did a random one. It's a "smart" inventory slot modifier. It only puts the item in there if the slot is empty. If there's an item there, it won't overwrite it (in case it's an important item you forgot to move or something). It took less than a minute to make

removed

add an activator if you want. It's set to write a pitfall, but you can replace the 1566 with any other item hex.