Thanks, that's definitely useful!
I also found out that you can get infinite unit cards by modifying the value for extra awards bar (the one you get after 25 draws).
Still no luck in modifying medals themselves and/or rest of the items (their quantities are client-sided, but I seemingly cannot access them easily
I was also trying to change the achievements awards, but the amounts there are not big enough to filter them off
Hero value can't be modyfied to a negative number, which is a shame
If you find any other methods, feel free to submit them here