brisk sluice
As the game currently stands, I know to avoid touching borders with other civs because that causes a negative diplomatic modifier with that civ. Somebody else settles to close to a someone else's capital and it causes grievances with me (I think...) What if each of these diplomatic modifiers had to be slotted like Traditions? Maybe I don't care about touching borders, maybe I do. You could have to slot two each positive and negative. And a third slot for double penalty or bonus, because maybe I really really hate touching borders.