Is it possible to prevent vassals to create Titles? I find it very silly and ahistorical that a vassal can just creature titles without interaction or consent from the liege. There for i would like to add a quick mod to my game in which you're (and the ai) only able to create a title if your independent. I'm not sure if this is possible,i'm very new to the modding scene.
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Yes. You'll have to add whichever restrictions you want to the 'allow'-clause of each and every title you want this to apply to. You'll likely want to use a scripted trigger, so you can easily change it later.
You can block all pre-defined titles with proper allow blocks, but any custom titles created e.g. from the CM custom kingdom/empire decisions or nomadic settling cannot be blocked this way. I don't believe vassals can create any of these from scratch, but if someone has created such a title and it no longer has a holder vassals could recreate them unless their government type blocks creation of that tier, so if you want to be 100 % certain that vassals cannot create titles you'll either have to get rid of all ways to create such titles (simply disabling custom titles is insufficient, since other things can create them) or add a vassal-specific government type that blocks kingdom creation (there's no government setting for blocking duchy creation (but also nothing that creates custom duchies that can be recreated in vanilla), so that still needs to be blocked in the allow block).