RightO, was taking a break from this for a while, but ready to sort that if you're still willing to help me in this largely unnecessary task.
So I tried the code you posted by first pasting it in the globals.script by placing it in the spot the was already identical to it. So I put overwrote "or i in traitpool: to baby.add_trait(i) in the file where they naturally appeared and it looked mint but expectedly didn't work. Than i just dropped it in there were it looked pretty and added a tab to the beginining of each line, but that didn't pan out either and that's as far as I've gotten flailing in the last 10m.
Edit#1: Alright got it in the globals with out crashing going to test if it works out for me, than try for the adding traits on game start and maybe that piercing one you mentioned.
Edit#2: Made some babys. They inherited sexual traits and traits I edited to be never inherited. So while I don't crash with that throne into globals, it hasn't appeared to work.