Maor Suggestions;
(1) While being within the Dragon Cult, you can gain a Dragon Mask artifact randomly by event
(2) Miracc's Cult can bring Miracc back to life or return him as a powerful courtier/king/whatever
(3) Necromancery Cult will give priest titles a necromancer trait
(4) I always thought this would be a interesting idea when it comes to traits, a kind of 'leveling' system for certain traits like trusting or deceitful, like 3 traits for each direction which either makes someone simply deceitful or a master trickster or whatever. Even when it will kind of clutter up some of the traits, it would definitely in my opinion make characters more defined.
(5) Special buildings I am guessing has been mentioned, but it would make more sense for certain buildings to specifically go along with say the drauger or the undead in general, like only a couple buildings for each titled land (Like castle become crypts which solely produce levies, a city which becomes a ruin which provides some levies with a number of buildings acting as modifiers, and temple holdings giving mages and stuff, but also giving major modifiers like prestige or piety to their liege)
(6) I'd always imagined it better for some Redwall mod or something, but a major series of events which depends on the title of players which they go on a adventure via decisions menu in which they will go on a set random venture which they gain/lose treasure, gain/lose courtiers, gain friends/rivalries, and a number of other things depending on whom is going on the adventure, making bigger rewards and losses the higher they are feudally. Like for example, having a mage having the option of going into oblivion or a adventurous emperor exploring the surrounding lands. Just a little bit of a idea;
Counts - Survey the Country Side (A good and short adventure with minimal rewards but with no real threat, with only some short events showing local peasants praising their liege lord and show life in general within the realm based on modifiers of the realm possibly, like bandit hordes resulting in a bandit hold up or vampires in the capital county causing visible unrest resulting in lowered prestige or piety)
Solve a Mystery (A count solves a local crime in the town, which has a higher reward but also has a high chance of failure without a good intrigue check, which increases the modifier of success significantly)
Explore a Cave (The Count and some of his men explore a cave to root out a beast type, and the only possible way to die as a count, but offers high rewards of prestige and coin, and is based mostly around martial skill)
Dukes - Go to the Imperial City (Duke titled players make a public trip to the Imperial City, with many possible interesting flavors of events. The Idea is that their stay in the Imperial city will make a player lose coin, but have plenty of options to gain prestige and make friends with the owner of the Imperial City)
March against [neighbor] (Have a duke gather a host and march against a random neighbor, gathering resources and men for a single march against a county, with usually a high risk of death due to being so open)
Quest for a Deadric Prince (The Player approaches a shrine of a Deadric Prince to find reward, going on a quest for said prince with a reward of converting to their religion and gaining the artifact for free)
Kingdom - Explore [local province] (The Idea is mostly by location where the capital county is, like a king with his capital in Black Marsh will go on a local adventure in Black Marsh, gaining Black Marsh courtiers and giving into Black Marsh lore stuff like a character going into a Argonian Tribe, just mostly a typical flavoring of events)
Go to the East (Have a Character in Tamrial go East, comedy ensues)
Sail the Sea (A character with a sea province goes out to sea for adventure, adventures at sea and being shipwrecked on a island province ensues)
Explore Oblivion [Mage Only?] (Have a King whom is a mage/have a mage in court, attempt to open a portal to one of the realms of a Deadric prince. Getting stuck in Molag's rape land ensues)
Empire - Prepare for Invasion (A emperor title gives a unique adventure of seeking out to prepare for a kingdom sized invasion of a random neighbor, with a high dose of problem solving in order to gain support or it miserably fails into a full flown revolt and war)
Hunt down [Rival] (A Rival of the current player becomes the target of a adventure, a epic chase ensues to kill or assassinate a random rival)
Explore the North (Freeze in Atmora)
Seek Peace in the Realm (Mostly a realm stability idea, where the character convenes a court or travels to a local unruly vassal to improve relations and hear their pleas, a way to through events to remove factions and improve relations)
You know, stuff and things.