NHF – new heroes for Heroes V 3.1. Auto-translated

I'm still finishing the game on an old version of NHF that's a month old.

Grant a bonus to knowledge based on other stats, but don't make it too large.

Added 15 minutes later
Perhaps it would be worth adding some kind of bonus to initiative, for example, for every 5 units of knowledge.

You can simply grant a bonus to knowledge based on levels. It's much easier. Why come up with something so complicated?
But on the other hand, something similar already exists. And essentially, both would be indistinguishable. That is, it would be a duplicate.

Here's an idea for a special ability for a male hero: "Womanizer."
The concept: The hero gains +1 to defense and attack for every 50 beasts/furies/hags or every 8 witches/shadow lords/mistresses, 25 shamans/daughters of earth/daughters of the sky. If he loses his "girls," the skill is reduced by double, and his morale is decreased by one. The overall increase (or decrease) increases by 1 unit of defense for every 9 levels of the hero. But that's not all. For having attractive heroines from the Dungeon, Sylvan, and Haven factions under his command, the hero receives a 10% bonus to his overall skill increase for each heroine. Nuance: if the heroines die, the hero loses the bonus threefold. If Vidomina is on the map, the hero's morale is constantly -3 plus 1 for every 7 levels of the latter. That's how it is. A well-thought-out special ability with great originality.

We could definitely create the first part. Checking for the presence of creatures, heroes, Vidomina, but the disappearance part...

Here's an idea for a special ability for a male hero: "Womanizer."
The idea is this: the hero gains +1 to defense and attack for every 50 beasts/furies/hags or every 8 witches/shadow lords/mistresses, or 25 shamans/daughters of earth/daughters of the sky. If he loses his "girls," the skill is reduced by double, and his morale is reduced by one. The overall increase (or decrease) is increased by 1 unit of defense for every 9 levels of the hero. But that's not all. For each attractive heroine from the League of Shadows, Forest Union, and Order faction under his command, the hero receives a 10% bonus to his overall skill increase. Nuance: if the heroines die, he loses the bonus threefold. If Vidomina is on the map, the hero's morale is constantly -3, plus one for every 7 levels of Vidomina. That's how it is. A well-thought-out special ability with great originality.

What does the command @NHF multiplayer = 0 in the console mean?