Suggestion for alternative Japan unique power:
The Power of Culture: after discovering all medieval technologies, core & historical* cities receive additional research** equal to 10% of culture production.
- Reflects Japan's modernization post 1600, and the relevance of today's Japanese corporate/consumer grade cultural output (i.e. lean manufacturing/manga).
- Modernization boost slows when Himeji Castle becomes obsolete. Effectively becomes a production boost with the availability of half price factories.
- Industrialization/globalism boost from film, radio, and TV.
- Rewards completing the culture goal historically (not culture bombing with 1/2 cities super early).
- Effectively grants 5-15% additional base research to qualifying cities. +20% boost during Himeji Castle era.
- At least AI Japan will see some benefit.
This encourages the tech catch-up & become tech lead gameplay.
The current git version Japan has very fair modifiers, but arguably too good research rate pre-renaissance. This UP allows for a somewhat dynamic research rate tied to culture production. If implemented, I suggest adjusting Japan's base research modifier to compensate.
Hopefully the idea is technically feasible.
Notes:
* If applied to all cities, this may be difficult to balance. Let's avoid totalitarian anime domination (for now).
** I prefer additional commerce instead of research, but not sure due to possible culture slider recursion weirdness (+10% commerce >> +1% culture >> +0.1% commerce >> etc.)