I did not say +2 const while drunk, I said +2 const instead of +1 sneaking or some kind of buff while drunk
You could also say no debuff while drunk, but not sure if there is any alcoholic potion so far, that would make it even worth considering.
I know, that humans have bartering, but you could give them something else in case.
Is +1 Max AP powerful? Most times you hardly get to max. Sure, you could give a dwarve glass cannon, but if you are stunned, 7 ap don't help you anyway and dwarves are more frontline with their +2 strength. And even then it's hardly more powerful than 20% extra damage.
