In D:OS and D:OS 2, there is no such thing as a passive skill. Skills must be activated (or at least toggleable on and off). If they are passive, they are Talents. So your suggestion for humans is not for a Skill but a Talent.
This isn't related to the OP's post, but I'm just going to repeat my dislike for Fire Breath:
Lizard's Fire Breath is bad because it can generally be replaced with dropping a candle out of your inventory and throwing it. It is also the ONLY Racial skill which requires points in a specific ability (Pyrokinetic) to be improved. It should be replaced with "Shed Skin", which removes all positive and negative status effects immediately, at the cost of a temporary (1-3 turn) small debuff to CON.
Fire Breath can stay in the game as a Pyrokinetic skill anyone can use.
