Actually Academic Disciplines does have a minor effect on cultural MTTH.
But given how late one would get it in the game, how minor the bonuses are, how much cultural spreading you'd have already done by the time you got it and the fact that it's unlikely the tech would even spread out from your capital to a non-cultural area in time for you to use that bonus to convert, I think it could easily be classified as "useless".
I'm not sure it'd really make sense to give any naval bonuses to conversion- or maybe they could just be equal to military ranking. I think techs should be set to start from level 1 to 4 (or 5- but 5 would require "perfect stats" tech-wise) based on tech levels in end-game capitals.
My suggestion is that Religious Stringency techs each shift you towards narrowminded while Religious Flexibility techs shift you towards innovative. This could also have effects on Serfdom vs. Free Subjects.
Profane Art vs. Religious art could also give points towards innovative vs. narrowminded.
Siege Weapons and Defensive Tactics could each give points towards Defensive, while Slash Weapons and Offensive Tactics could each give points toward Offensive.
Noble Customs could each give points to Nobility while Popular Customs could each give points to Plutocracy.
Land and Naval sliders should be set at neutral since there's absolutely no ship combat in the game.
Perhaps Naval tech level could be set at whatever the highest level of shipyard in the capital is. 1 for no shipyard, 2 for a small one, 3 for a medium one and 4 for a large one. (with an additional level 5 if every Weapons stat is maxed)
Government tech could be based on Schools and Thought tech with levels 3 and 5 in each each giving one extra points towards government tech.
I would set Production bonuses to give +1 to at least a level 4 tech in... Farming Equipment, Cattle Herding, Handicraft, Mining, with an extra bonus if all level 5 bonuses are held.
Commerce Institutions could each give one point to mercantilism while Fairs and Routes each give one point to free trade.
I'd probably reward Emperor to whichever country has the highest Prestige and give Papal Controller to whichever country has the highest Piety.
IDEAS FOR LAW EFFECTS
(not sure about how other inheritance laws should be reflected- maybe ones which allow female tracing can be given slighty innovative bonuses)
Semisalic Consanguinity = +1 Centralization, -1 Nobility
Elective Law = +3 Nobility, -2 Centralization
Royal Prerogative = +2 Centralization, -1 Nobility
Feudal Contract = -2 Centralization, +2 Nobility
Traditional Custom = (no effect)
Popular Law = +2 Free Subjects, -1 Centralization
Regal Supremacy = +2 Innovative, +1 Centralization
Church Supremacy = +2 Narrowminded, -1 Centralization