It's pretty safe to say that there are no "human" effects - by which I assume you mean psychological - built into the SIM at all. Every plate appearance (for both hitters and pitchers) and every fielding opportunity is simulated by a purely mathematical algorithm based on a small number of underlying statistics.
While I obviously have not seen the exact code, I think it is a very safe assumption that there are no elements programmed into the SIM that incorporate things like batting order protection (other than the possibility that your guy may get intentionally walked), clutch hitting, streakiness, "closer mentality", pitching to the score, veteran leadership, etc.