I made some tweaks to the AI in the new version of Leaders Enhanced. I hope that if they prove themselves useful, Ahwaric will add them to the main mod.
The core things are beelines: if the AI has sea food nearby its capital, it will research Fishing right away. If not, it will research Agriculture right away. Then I run a function that checks what tech the AI needs between Hunting, Animal Husbandry, Masonry, Mining, Calendar and Pottery. They will research the one enabling most of their resources first, then the others. I think it helps the AI a lot at the start...
I also removed the Bronze Working beeline from the Doviello and the Bannor. That's why they're so crappy. They overlook agriculture for Masonry -> Mining -> Bronze Working, nearly 100 turns wasted on normal without even researching a food tech.
However, the AI is still crappy when it is overwhelmed by animals or barbarians... Will need to check that