Currently Realism Mode does the following:
-Changes the HP Values on a couple zombies to be more realistic.
-Changes the Damage Values on a few zombies to be more realistic.
-Makes it so the Regenerator and Pest cannot revive themselves under any circumstance.
-Makes it so Feedback and Bosses cannot summon allies.
-Makes it so Swarms are invulnerable to Bullet, Slash, and Club Damage.
-Makes it so Juggernauts, Bulldozers, Smogs, and Meatheads aren't considered huge monster (ENT.IsHugeMonster = 0).

If you have any ideas to improve/add to Realism Mode then leave them here.