Open the console and type (without the quotes):
"Set X to Y"Replace X with a setting and replace Y with a value.ZombieDifficulty controls the health and attack damage of zombies. Values are 1 = medium, 2 = hard, 3 = insane, other = easy. It does not affect already spawned zombies.ZombieAmount controls how many zombies spawn at each spawn point. So by putting 2, you double the amount of zombies. By putting 3, you triple the amount of zombies.ZombieInfectionChance is the chance of success (as a percentage) when a zombie tries to infect a target. Type: Float, Default value = http://forums.bethsoft.com/index.php?/topic/1084268-quick-fose-mod-help/20.0000.ZombieRespawnTime is the amount of time before a spawn point can spawn another zombie in seconds. Type: Float, Default value = 90.0000.ZombieSymptomFrenzy is whether or not infected invdividuals will frenzy and attack everyone. 1 is enabled, 0 is disabled. Type: Integer, Default value = 0.ZombieSymptomHealth is whether or not infected invidivuals will lose health by the second. 1 is enabled, 0 is disabled. Type: Integer, Default value = 0.ZombieSymptomTime is the amount of time it takes (in seconds) for infection symptoms (frenzy and health loss) to kick in on an infected individual. Type: Float, Default value = 90.0000