Herbal Medicine - moved to Feudal Age
Barracks able to be garrisoned by infantry units
Archery range able to be garrisoned by archer types
Stable able to be garrisoned by cavalry types
Town center: Able to be garrisoned by cavalry and cavalry archers - or just the starting scout if it’s too strong or just light cavalry in general/scout line, etc
This will allow for an effective unit healing method in a time of the game where it can be utilized effectively both offensively and defensively before the time of the monks and would be healthy for injured villagers as well after the dark ages and into the dangerous feudal age and beyond.
Overall this is a huge buff to herbal meds both in the time it can be used as well as where it may be utilized.
Added ideas from comments:
Castle able to garrison siege units, trebs(packed), hussite wagon, organ gun, mangos, scorps, rams, etc
Fishing ships able to be garrisoned inside docks
Give all civs herbal meds