Interestingly, alcohol was one of the first PED's used in sport in a cocktail with strychnine. Some people though etoh increases pain tolerance and decreases anxiety associated with performance. That said, data does not support this for endurance or strength sports. And no, alcohol does not improve neural recruitment or "even out" a mental response. That being said, the placebo effect is very very strong, at times. Chris Duffin talked about doing shots of bourbon before deadlifts, but again- there's no evidence to support that this is a good idea.