Funny, I'm currently in the final testing phase of my own mod that completely redesigns the entire Centralization Mechanic and how laws are implemented in general. It should be released some time tonight, though that's just version 0.01, I've still got a lot of things I will need to implement once the core mechanic is sound.
Other than that, most of the game seems pretty good, albeit lacking in detail in some areas. In other words, the game is a fairly well designed framework which could use some fleshing out in spots, just like every single other game Paradox has ever Produced.
THAT Said, Where are all my Variables? And Title Flags? Are they just gone? Are they Hiding? I see nothing in either the events or the saves to suggest they exist, and that makes me sad.