• Handycap: Deity is fine.
• Unit gifts: Either no or completely unrestricted. Attempting to limit them will be a problem. For example, what about UUs? Can I trade my Muskeeteers for your Cataphracti?
• Vassals: No
• Goody huts: No
• Events: Yes
• Barbariens: Yes
• City trade: Only if arbiter allows. (To complex to summarize idea here)?
I like the idea, with an arbiter. Trade a city for peace, but can't give away your cities to your ally if you are dying.
What about all the other issues. Trading cities for gain. I give Industrious Friend a city, he builds a wonder for me, gives it back.
I give away a city with a National Wonder so I can rebuild that wonder somewhere else.
• No capital companies (too strong, especially on a huge map.)