Gonna list a few ideas that have in my mind for a while
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Brick roads
Could be either an upgrade for stone roads for a slight more boost in movement or an alternative for maps where there is plenty of clay but not enough stone. Also it would add another visual for road for those who like to beautify their city -
Wagon shop
This building is in a bit of an odd position. I understand the logic behind it that you need it before making mines to transport it, however from wood you just craft an ox/cow, which makes it weird for me
Wouldnt be it more logical to have it opposite way so instead of wagon shop being the prerequisite for mines make it that you cannot have a wagon shop without a mine?
Also, maybe it would make sense to use your own cows for a wagon, aka the shop creates a wagon, but you have to use 1 cow from your barn/trading centre to put that cow in front of the wagon (if it is immortal or dies in X amount of years that can be decided) -
Wall/gate merge
As many people are making double/triple walls, would it be possible to make at least graphic wiise a “merged” version, like instead of double stone arch, make a big longer arch
Also, tier 3 version of walls with iron+stone? -
Tier 1 production facility upgrades
Cobbler and compost yards are the main offender as others have said already, but basket maker is also something that could really use an upgrade as when you have a decent supply, you need to spam those buildings either just for your own people, not to mention if you have abundance of those and want to produce extra for trading -
Additional production chains
Tallow and wax is in a weird spot, being used for a single item only. Im pretty sure there could be some extra usage for those -
Hay
As for animal fodder and/or building material shouldnt be there hay included as a byproduct of grains? -
University
I presume because now we have none or basic education we can expect in the future a higher level of education for some special/complex jobs or as an extra boost to productivity, but only a few people should have such education -
Festival
Either via a the town hall or some special building we should be able to organize a festival (for a fee, be it gold, food, beer, etc) that would maybe provide some short term productivity boost or increased immigration chance -
Trade expansion
I believe it was mentioned before, but it would be nice to have an option to ask for “special” deliveries, aka putting out a word that you would like to have item X and a trader would arrive later on with item X, but obviously at high/very high price. However, if you invite traders, but you are not actually buying goods in a certain price range (e.g, no spending at least 2k at them) they wont come the next time you ask for them, but only with a severe delay and/or extra price