____PERSONAL AND COURT LEVEL
__Characters
More traits
Notes section (very useful for AARs)
Roman numericals for Kings
Name your children
More faces
Graphical family trees (ala Total War)
Inheritance of prestige and piety
Soubriquet/nicknames ala EU3 (at the dead of the ruler depending on what he/she did)
Courtiers having some job and able to marry (ala EU:R)
Keep protraits
Medieval tournaments
Ambitions (splited short/long term/hidden)
More interactions between courtiers in different courts
Relationship values between characters (wow, poor CPU...)
AI behaviour tied to ruler traits
Courtiers can be seduced by other courts
Twins
Bastards more ambitious and when no natural heir should inherit
Notable members of your court can find a spouse/husband, not just heirs and royal family (like EU:R)
Non-Christian names tied to religion, surnames to culture; when naming father culture prevails
Peasant courtiers (specially in republics)
Civic titles (ala plaebeian aedile)
__Dinasty/liege/titles
Ability to play the multiple kingdoms af the same liege (France-Normandy-England situation)
Ability to play properly and get fun with bishoprics, republics and knight orders playability
Ability to play with different lieges for different feuds
Tie lands to liege to allow multiple lieges
More rank tiers than King-Duke-Count...
Regencies (interregnum when a minor inherits)
Manual heir appointment (with power approval from the factic powers of your court)
Manual heir disappointment
Title appointment (for regional minor titles f.i.)
Abdication option
Emperors can have Kings as vassals
In the Christian world, keep the two Roman Emperors dynamic (if England wants to be an Empire, take it from the German hands and so)
Ability to offer titles to characters not of your liege
Dynamic Coats of Arms (and/or CoA editor)
More flavour titles (depending on the region/culture; Princes, Grand Dukes, Margraves, Earls...)
Marquis/Barons/Viscounts in (even if they have no demesne)
Honorary titles appointment (ala EU:R, but nobiliary titles), some may be nonhereditary
Name your vassals
Ability to "Knight" or "Sir" people
Ability to vassal someone of the same tier rank (King-King f.i.)
Different titles bear different prestige/points (King of Navarra must not have the same respect like King of France)
Surname/dynastic merging if last ancestors of a family get married
__Court
EU:Rome court options (exile, imprison [+ ransom dynamic], execution)
More in-game options and roles for marshalls/spy masters/chancellors/stewards/bishops...
Employed courtiers may decide to retire (by force or by age/illness) without having to die
Jewish courtiers in countries with historical jewish presence
More depth intrigues/espionage
____PROVINCE LEVEL
__Provinces
Multiple kingdoms/duchies on one province (so province can be part of more than one Kingdom)
Province population (so taxes and such based on)
Province goods and resources
"Imperial province" status to solve the Bizantyne meltdown too fast
More cultures
Better culture conversion system (maybe with percentages like religion)
Trade leagues (ala EU3 HTTT) and/or trade routes
Provincial desicions
Provincial fiefdoms (ruled by knights, ala EU3 Magna Mundi Sengoku system and/or a GUI for this
More people classes
__Religion
More religions (better separation Sunni/Shia, Monophysites, Nestorians, Jewish, various types of pagans...)
Better interaction and diplo options between religions
Percentual province religions (for a better convertion dynamic)
Diverse religious buildings available at the same province at the same time
Heresy system (Cathars)
Each catholic province have a bishop and you can see each ones' piety and loyalty (enters into dynamic of a better holy see control)
Sects (both secret and public) organizations, that if strong enough can lead to heresies and then into full religions
Interreligious marriage under certain conditions (like forced peace treaties f.i.)
Muslim sharia law
Different flavour religious laws ala EU3 Magna Mundi Platinum
More than one wife in certain religions
Ruler lovers/concubines, even official ones (it did happen historically)
____COUNTRY LEVEL
__Diplomacy
Victoria/EU-like negotiations
Press claims on behalf of your courtiers
Ability to control military orders
Sphere of Influence system (ala EU3 HTTT and Vicky 2)
Colonization dynamics
Ability to make a vassal stop a war
Delay all diplomatic decisions some days for a better representation of the period
Force vassalization
Client states system
Republics can have governors
Political system for republics ala EU:R
Alliances between Lords and Vassals are not allowed: the only tie is simply the feudal one
More stable alliances or at least a warning when your ally turns disloyal to you
Badboy
White peaces
__Laws
Cognatic succesion law, even various types of it
Restricted elective law that separates the ruler's demesne from the royal demesne
Inheritance law tied to titles, instead of the same for all the demesne
Bizantine Imperial Bureaucracy (no penalty to prestige of the liege for every vassal breaking free so the empire can hold longer)
More laws, either religious and political
Females can inherit under certain conditions
Vassal laws, like f.i. to choose between for-life vassals/ vassals must be reconfirmed after X period
__Revolts
Revolts (rebels with a cause system)
Civil wars, pretenders
Revolts ala EU:R (with loyal in-game armies joining a revolter character f.i.)
Ability to foreign-sponsor rebels
__Papacy
College of cardinals, ability to appoint cardinals
Divorce permission dynamics
Better crusading
Orthodox patriarch
Crusades against heretics
Heretics splitting religions
When calling on a crusade, the Pope and the Catholic Orders provide the naval transports
__Holy Roman Empire
EU3 HTTT system (with Imperial authority and such)
Simulate the Bizantine empire (so Eastern Roman Empire vs Western) in a similar manner
____GAMEPLAY
__Scenarios
GC from 1000 to 1492 (aproximatte of timeframe wishes)
Play with muslims and pagans (with the same improvements and game options than catolics)
Play with republics, bishoprics, orders and tribes (with the same game options than kingdoms or at least a similar enjoyment ala EU:R)
Scenario start date for each Crusade
__Ledger
Bridefinder
Alert system tracking for chosen characters' life and events
Loyalty tracker
__Map & GFX
More provinces, bigger map (ranging ideas from the current map is ok to cover all the world)
North Africa including the Horn of Africa (and african cultures and rulers)
Melanodermic/xanthodermic/leucodermic/mixed characters and artwork
Revolt risk mapmode
Persia, India
Different shields for each rank
No 3D... 2D! No, better make it 3D... well, we are not sure but I'm afraid that Clausewitz will be the chosen option anyway...
Courtiers with realm jobs should appear in a different way that normal courtiers (easier to see and control)
Culture map mode
__War & Battles
Naval warfare with fleets
Pay armies each 60 days but increase their costs
Option to station troops to a fort
Better army production (ability to recruit standing armies), movement and placement
Mercenary system (with abandoned mercenaries being able to settle down and have a tag, like the Catalan Company)
Military access and/or do not allow acces
Terrain have more effect
Possibility to choose various strategies of battle/siege depending on characters, terrain, armies...
AI dones't declare war to far away and/or unreachable realms (and have similar things in count regarding far away alliances, SoI, etc...)
Option to choose comanders for each army, ruler doesn't have to be the commander if you choose so (or if it's too old/ill/young)
Prevent counter-crusading and counter-attacks (when at war with someone, after the first fight both armies are besieging each others' demesne and the first who succeeds in the siege takes it all; this is a great source of blob and AI problems; maybe a reworked system involving standing armies [without the need to eliminate the CK I system, just complement it] and mercenaries can do a lot to that point)
__Trade
Some system that simulates important trade centers, not necessary like EU3 but similar
Trade routes ala EU:R but like Vicky railroads, but not necessary bidirectional
Some kinf of province economy/good with even secondary production ala Vicky