Hello!! Sorry for the delay in response and thanks for the feedback!
In response:
1. Any sim that is in a world that is not the world they live in will be considered an foreign sim. In the future i hope to expand this with introducing visa process to move to another world etc
2. After today's EA patch i will do an update to fix the issue of supernatural sims being affected when they are around other supernatural sims.
3. I am in the process of creating a website to provide more documentation and tutorials for my mod.. atm there is just the information on itch.io as well as this patreon post where i also explain what worlds are affiliated with different political ideologies (🌍 Behind the Scenes: Which Political Beliefs Dominate Each World? | Patreon)
4. In regards to lot traits and their effects i will update the itch.io page with some more information but each lot trait gives a positive boost depending on the political ideology of the sim(except libertarian currently)
- Law & order = Conservatives/Plumboblican
- National heritage site = Nationalists/Simlandian
- Activist hub = Progressive/SulSulite
- Charity Focused Community = Socialists/Landshaarers
- Community Garden = Environmentalist/Simstainables
- Simlandian Stronghold = Nationalists/Llamazonian