This entry appears twice in a row, and when you choose the two entries below those (anyAmount and AnyDamage) it still puts "mods.contenttweaker.MutableItemStack.amount(int)" into the script. So from that point onward down the list. you have to find the script entry you want, and click two rows down.
Btw.. GREAT MOD. I dont think ive been as excited to find a mod in years, as I did when i found this one. :)