Current bugs with mods cooked with 190 devkit (in 192 client/server)

You are allowed to touch it, I just highly recommend finding ways of not using it because it greatly reduces your compatibility.
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Changing certain things on the list are ok, but the list that you want to avoid though is the MasterItemList, and the Engrams list. There are definitely ways to still use both, but as Drathek said, that can create incompatability when combining mods.