Version 4.17
Fixed the Courtiers setting for the Knight Restrictions rule not working as expected.

Fixed the AI being overly aggressive.

Fixed peasant rebellions not being affected by the levy size rule.

Version 4.16
Did a pass to improve mod compatibility.

Removed nearly all vanilla overrides, so all features of MIV are now located in net-new code (i.e on_actions or new interactions altogether).

These changes were originally added for balance, but I've decided that maintaining compatibility with other mods is more important.

Deleted my changes to the following code:
contract_assistance_interaction and negotiate_alliance_interaction

found_kingdom_decision, found_empire_decision, and confederation_kingdom_ai_decision

send_gift_opinion and auto_grant_county_cultural_acceptance_impact

base_coronation_cost and coronation_broken_oath_punishment_effect

several options in interactive_override_game_rules (regional_heresy, custom_kingdoms, hybrid_culture_ai_restrictions, divergent_culture_ai_frequency)

murder_scheme_maintenance event and theodosian_walls

The removal of these changes ensures maximum compatibility with total conversion mods!

Reuploaded above.

Version 4.15
Added a game rule to remove the holy site requirement for creating a Head of Faith title.

Version 4.14
Reworked how Conquerors are selected. Characters with high martial skill, certain traits (ambitious, brave, etc), antagonistic house unity, or large herd size, are now much more likely to become Conquerors.

Version 4.13
Added a game rule to customize the Conqueror Limit. The number of conquerors that can exist at a time is limited to your specified setting.

Added a game rule to customize Great Holy Wars. Restrict Crusades and Jihads from being declared, or allow every faith to declare them regardless of doctrines.

Version 4.12
Added a game rule to customize Administrative Stability. All administrative rulers receive a modifier of -5 to -40 vassal opinion, making their realm less stable.

Added a game rule to customize Administrative Levies. The percentage of levies that administrative vassals provide to their liege is reduced by the specified multiplier.

AI now receives a discount for hosting coronations.

Version 4.11
Added a game rule to customize Defender Advantage. Rulers gain +1 to +10 advantage when fighting on home territory, improving their odds against invading armies.

Added a game rule to customize Commander Advantage. Rulers gain an additional +1 to +10 advantage when leading their own armies, but risk capture when defeated.

The Supply Capacity game rule now scales by units of 50 instead of 100.

Version 4.10
Made several improvements to the Bannermen feature. It now lists the number of vassals that answers to you, the total military strength of your realm, and how many vassals are currently in Open Rebellion.

Added a new game rule to disable de jure Title Creation for empire-tier and kingdom-tier titles, requiring them to be founded via decision instead.

Added a new game rule to customize Faith Reformation, allowing you to change the requirements to 2 holy sites, 1 holy site, or disable the requirement completely.

Added a new collapsible decisions group called Vassal Decisions.

Added -35 and -40 options for the General Opinion game rule.

AI will now form custom Kingdoms and Empires more often.

Version 4.09
Added a Belligerence rule that allows vassals, under certain conditions, to openly challenge their liege's authority, refusing to serve as knights or commanders and declining all call to arms for both civil wars and external wars.

However, this grants the liege an imprisonment and title revocation reason on the vassal.

Added a Diverse World that converts all rulers to random cultures and faiths at the start of the game, best used with shattered world.

Added a General Opinion rule that allows you to decrease the baseline opinion for all characters, creating a more treacherous and unpredictable world.

Added a Title Men at Arms Limit rule that allows you to increase or decrease the maximum MAA that can be recruited for administrative realms.

Added a Men at Arms Limit reduction rule to decrease the maximum MAA for all characters globally.

Added a Life Expectancy rule that allows you to decrease the average lifespan of characters, making the game harder.

Made various AI improvements, balance changes, and bug fixes.