Thalassicus
Bytes and Nibblers
Trade routes are now designed to:

- Pay for roads.
- Increase citystate yields.
- Provide bonuses through policies and techs.

Portioning a part of CS yields to civs with a trade route would be great for both flavor and gameplay.
Puppet
Razing
connected to Capital
or
from citystates.
It's obviously not a high priority, but it would certainly make for (even) better gameplay.
(Yes, I may be a bit biased.)
to his UA could be cool/flavorful. (Now I get why that bonus was attached to Machu Picchu before!)
Golden Age points.