So you've captured a new town.

[ReluctantSamurai]

Though I give diplomats diplomatic immunity

Never Even diplomat's belonging to an ally are fair game, unless they take care of their business and move along. I simply detest diplomat confab's next to my cities...

I don't like relying on a governor for public order, because eventually he will die or be killed in a riot. Also, if he is a good commander, I like to have him in the field instead of using his influence to keep public order high

Clarification: I only use a family member to keep public order when he reaches 60 and has passed the torch to a young and upcoming general (nothing worse than having your Legendary Everything die just before a big battle). Veteran former field commanders are excellent for this because they usually have accumulated a pile of influence laureates. The faction leader has a built-in security retinue that can detect spies and kick them out of a city. When a city reaches ZPG, it doesn't need a governor of any kind...

I believe a +1 is 10%