But the Rome system both puts the player [i.e the state, character etc] in command of miracles, and it says miracles are magic that can be called on regularly to save the day.
Avoiding the kinslayer trait is enough motivation to keep your bad stat heir alive. And of course you dont need an in-game reason if you have a story-reason, i.e. dont kill your son for gamey reasons.
Don't play MP do you? There gameplay > roleplay any day of the week because if you have roleplay > gameplay, you lose. This mentality is brought over to SP by a lot of members, but it does become important for MP where people do like RP aspect and making AARs and such and would love to have an in-game reason to keep their pitiful ruler, but they won't do it if there is none.
Also there are plenty of events in CK you can chose to simply do the most dangerous one if your current ruler is worse than your heir apparent all without having him gain the kinslayer trait and perhaps profiting you for chosing the gamey choice on top of getting a better ruler.
The Rome was doesn't make sense, especially not for the Middle Ages. Maybe it does alittle for about two generations in the middle of the punic wars when the romans were mad on omens. But on the whole it says all people are stupid and priests are evil and use pretend miracles to tyrannically control the masses. And with effects, sudden and all powerful.
It has no plausibility. If youre going to do that why not replace taxes with money that comes from a talking tree.
You need to brush up on your history. The sway of the church on the masses was far stronger than you think it was and even on the educated elite it had signifigant sway. The rituals changed, but they were still there; many RCs back then actually believed that the eucurist rituals actually did transform the bread and wine.
But Miracles should not be made into a gamey gimmick, not only is that bad for the game in game-play terms to have something like that no matter what you call it. But its damned offensive too and removes all reason and plausibility from the game.
Then tell me how you deal with the issue I raised. It's easy to say no because you don't like something and ingore the core issue something tries to resolve. And before you state it, Sute's legitimacy has just as many flaws as this proposal has and is grounded in just as much reality as this and furthermore cannot deal with situations where you have a currently long-running poor ruler who might in-game have a great deal of political clout and a successor who is very legitimate who doesn't. The choice there would still be the same as CK1: a no brainier to off the current ruler by gamey means necessary.
You only deal with events that are things the character would deal with, on the whole you only control that the character would deal with. Why should the handling of Miracles be any different?
Well then why hand off character selection to a game mechanic instead of making it an event? Why hand off DoW to a game mechanic rather than an event? Why hand off marriage to a game mechanic rather than an event (as they do in Rome)? You can hand off anything to a game mechanic because its better served than through events, such as what I propose.
A Bad heir should mean a trouble horizon, a compromise with the lords and barons or a civil war or atleast some unhappiness and refusal to raise troops or pass on taxes. And the game would be less fun if it didnt.
And there are many ways to avoid trouble without resorting to mad magics
Again, your assuming things wrong. I'm talking about times when the heir is a great one stat-wise and trait-wise, but poor politically and prestige/piety-wise. The gamey thing would be to remove the current ruler. The actual historical thing, since you're playing the current ruler, would be to keep himself on the throne as long as possible unless he might be humble.
I mean imagine your ruler was scitzo, inbred, stressed, kinslayer hole-in-the-pocket with 3/1/2/0 for stats and his heir was a wise, energetic, midas touched and 9/7/9/15 for his stats and you had an event (knowing you can see the results):
Their is a cute fluffly bunny next to a cave. Some of your companions seem deathly afraid of it. Do you:
A - Kill the Wabbit! Kill the Wabbit! Kill the Wabbit!
gain reckless
lose coward
75% chance death
B - Pet the rabbit
guaranteed death
C - Run away
gain wise & coward
Now what if the positions of heir and ruler were reversed? There are obvious choices based on this because their is no benifit for having an incompitent ruler which leads to those gamey decisions people want to avoid. My proposal offers a way to give players an in-game reason to pick other choices.