@Pavía since you asked, here's my wishlist for new modding features.
Institutions
- Change the history function in common\institutions\00_Core.txt to treat countries and provinces separately
- Allow countries to embrace institutions without automatically spreading them to all owned provinces
- Allow countries to have any proportion of their provinces embrace an institution, but start without the institution embraced
- Add a country scope effect that causes a country to embrace an institution without spreading the institution to its provinces
- Add a define that changes the percentage of development that a must have an institution fully present to embrace it
- If possible, instead add a moddable parameter to institutions to determine how much of a nation's development must have an institution present before a nation can embrace it (e.g. Renaissance might need to be present in 30% of a nation's autonomy-modified development, but Colonialism might only need to be present in 15% of a nation's autonomy-modified development before each can be embraced)
Trade nodes
- Add modifiers multiplying the incoming, outgoing, and local trade value using the trade node scope
- Allow a country's share of the trade power in a particular node to be exported to a variable
State effects
Create effects to add and remove each of the following in states, using the province scope and analogous to the add_trade_company_investment effect.
- Holy orders
- Edicts
- Pashas
- Patriarchs
- Centralize state
Province effects
- Add spawn effects for all special units (I think the only types missing now are janissaries and all types of revolutionary guard units)
- Add a unit drill parameter to the effects that spawn all regular and special units (this obviously wouldn't make much sense for add_unit_construction, though)
- Create an effect to add and remove the expand infrastructure modifier from a province
- Create an effect to set/unset a province as the tribal land of a particular tag
Province modifiers
- Local missionary strength against heathens; local missionary strength against heretics. Both are analogous to existing local_missionary_strength modifier
- Local land force limit multiplier; local naval force limit multiplier
Country effects
- Add an effect to set a country's naval doctrine
- Add one (or two) effect(s) to:
- Expand a country's administration
- Increase the number of times a country has expanded its administration so that expanding administration has the correct cost in the future
- Add an effect to immediately start a disaster, even if a country doesn't meet the disaster's start conditions
- Add two effects to:
- Add or remove a country as any of the three types of hegemon
- Add or subtract hegemon power from a country
- Add an effect to add/subtract tribal development
Other
- An effect to add/subtract tribal federation cohesion
- An on_action for colonial nation formation, analogous to on_create_client_state
- Moddable AI behavior for national religious conversion
- An effect to add reforms to the Holy Roman Empire. The inverse of the revoke_reform effect.
- Add an effect to add and remove Celestial Reforms to the Empire of China. Analogous to the revoke_reform effect for the Holy Roman Empire.
- A define that gives drill to units that already exist in any start date (not newly trained units) as a function of professionalism. For instance, in later start dates in which countries have 60+ professionalism, their units might start with 60 drill. This value could be set to zero by default to avoid affecting un-modded EU4.
- Allow province groupings such as trade nodes, trade companies, colonial regions, and institution spreads to be made by area or region and not just by province
- If possible, make the effects of diplomatic actions moddable. If not, ensure that all diplomatic actions and subject interactions have moddable trigger conditions.
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