This is where I started
https://f95zone.to/threads/breeders...a-derelicthelmsman.2483/page-170#post-2435109
Its pretty straight forward. Yea the cheats were added to help ease frustration for players getting save wipes so they can explore and test the builds without having to do redo so much tedious stuff each time there is a save wipe so it won't be in the final release of the game.
(snip)
The "Busty" trait does physically add to these values so you'd see something like "Breastsize 10 = 1.33" or close for Busty nephs. However, the "Hung" trait does not. The "Hung" trait basically just adds a bit to any penis in the game and it can even seem longer with a fatter neph.
If you edit a neph with a lot of traits most won't affect that neph visually even tho they are now there. You'll need to breed with another (and with high trait level) to breed those traits into offspring which will be visible. Otherwise you need to edit the values individually to see the change.