I am enjoying Rome 2, but diplomacy and the AI's behaviour is irritating.

For example, I started out as Massalia who are on good relations with Rome from the start. Rome flat out refused to a trade agreement or even non aggression pack until I offered them 2k gold 25 turns later...

Same goes for the AI's suicidal refusal to surrender. I was at war with a Gallic faction, they had 2 provences, I took 1 and crushed their main army. I then asked for peace as I have crushed them and at this time doc not want to conquer their remaining province as it is out o the way and would be a pain to hold. They flat out refuse to surrender, so are a constant pain in my kingdom's eastward border until I wipe them out...

Are there any good mods on the workshop which improve the AI's really stupid diplomatic behaviour?