In game it seems like it's just a +1STR/-1WIS trade per Drunken Master level. Always got 1,2,3 increase/decrease as i advanced in that class (from lv.1 to 3 yet).Drink Like a Demon
From level 1 a drunken master's body handles alcohol differently from other people's. He can drink a large tankard of ale, a bottle of wine, or a corresponding amount of stronger alcohol in a single round. Every bottle or tankard of alcohol he consumes reduces his Wisdom by 1-3 points, and increases his Strength by 1-3 points, depending on the strength of the alcohol. A drunken master may benefit from a level of drunkenness equal to his class level (max +10 strength), but he is not allowed to go lower than 6 wisdom. The duration of both the penalty and the bonus is 5 minutes. The duration is renewed with every bottle drunk, but the master will gradually sober up as the alcohol leaves his body. (If the drunken master is immune to ability loss then the drinks have no effect).
There seems no randomness at all.
Would be nice, if it's an actual roll, even better if it would be 2 seperate rolls for STR and WIS. Maybe one could increase the dice range from d1 up to d10 when advancing levels.
Other than that, the class seems to have very few useful feat picks on levelup, maybe add some more here (combat focus line, shield line, monk feats ......)
Would be really nice, if the improvised weapons all got a unique look (like the broken bottle). Using a default kama, club, staff is no fun.