Ok, I'll admit, I only read eight pages of this. It seems to be all about gunpowder and (magical) explosions and the flight dynamics of arrows. Which is all well and good. But as a discussion on pre-1400's technologies there's a lot more I'd like to see.
1: Ploughs. Just as a tool so farmers can go farming. Maybe with animal pets/servants. That was half the reason for some livestock. Meat/milk/pull a plough. Makes sense really.
2: Saddles. With saddles comes riding. Better quality saddles makes it easier to use your "riding" skill without falling off. Riding means cavalry. And stuff.
3: Gibbets, hung cages, random torture devices. Make a statement. Or extract information/secrets. Maybe it could effect the morale of invaders or annoy them more. When I think medieval/dark ages I think heads on spikes. Now I've mentioned it, so do you.
4: Material options. Could be a thing for alchemists to do or implemented using the "secrets" thingo. Your civ can both research/use either better or worse types of metals/materials. Damascus Steel? Nah, this is the steel of the Brotherhood of Lounging, that's at least 3% better at holding an edge and is a tiny bit crappier at absorbing blunt impacts. Makes for some really varied worlds, where the basic ingredients are the same (bronze is still copper and tin) but you might just be better or worse at forging them. Opens up elves to have some pretty damn nice sticks too.
5: Seige materials. Not necessarily seige engines (they required dozens of people just to move/construct them) but just simpler stuff. Ladders, ropes and braziers(holdable fire, weaponized for attack or defense). Your wall or drawbridge isn't half as defensible now, is it?
6: Bridge/road tolls. Just so you have a reason to build them. Nobles tend to tax the road they just made, with the promise of defending travellers. Could be another mandate ("Make a road from here to here.") and then gives you another sort of invader (Bandits. You must protect the odd group of travellers. Or have less immigration/trade and another pissed-off noble).
7: Taxes. Unless you are mountain home you get taxed. Food/goods/money and military service. There will never be enough plump helmet roasts again.
I know a lot of these things are planned. But really, pre-1400's technology means a lot more than were guns better than bows back then. They weren't by the way.
So can we discuss a few more types of techs (and how you'd like to see them implemented) rather than the "I want an assault shotgun because dwarves are cool!" kind of thing?