RIghtO, been playing with it after you gave me some more leads to go on. Haven't yet found any trait/effects that stay. For instance adding the effect of the tattoos doesn't actually do any thing or even change the interface. Seems to just count how many you got or some thing *shrug*. So mostly can just add traits for flavor in character description and if you're so inclined to can edit many of the values. I've no notion if adding traits like "pretty voice", with or with out effect changes job performance.
Looked around and found what influences detection I think. So off the bat and correct me if I'm wrong, Wolf +4, Hunter+ 10, Tattoos +3-9, +Wit/10 (which since you can't increase as MC is probably a potential loss of 7, but you can also still edit wit in file so there's that) No doubt over kill, but min maxing is half my fun.
The two fields for MC spec, if I were to guess influence different things. If you replace one you lose your description in character sheet, with no benefits, if you replace the other, you gain the benefits, but the character sheet stays the same. I doubt I could ever find out if some thing some where read "description" one for benefits instead of the "stat" one.
Still its been useful for making suboptimal slaves that I like or are story related optimal as well as throwing some flavor traits around.