I played around with the LeaderHeadInfos.xml. I set both iSameReligionAttitudeChange and iSameReligionAttitudeChangeLimit to zero, so that nobody gets any diplomacy boost for sharing the same religion. The penalty for having another religion still applies, but it is small (-1 or -2) most of the time. I hoped that this would lead to more battles among the catholic nations, as someone already sugested in this forum. But i didnt see much of a difference. Most nations still had pleased or even friendly diplomacy status. "Open borders" often gives +2, and another +1 from "years of peace". That makes +3 and that is often enough to get a pleased status. At least between AI palyers.
I would have liked to change the tresholds for the different diplomatic status but i didnt find out how to do that. They seem to be different for each civilization. I know that there are some hidden modifieres in RFCEBalance.py but i think there are more that i dont know of. Is someone familiar with this kind of settings?
Then i found these settings in LeaderHeadInfos.xml
Code:
<NoWarAttitudeProbs>
<NoWarAttitudeProb>
<AttitudeType>ATTITUDE_ANNOYED</AttitudeType>
<iNoWarProb>10</iNoWarProb>
</NoWarAttitudeProb>
<NoWarAttitudeProb>
<AttitudeType>ATTITUDE_CAUTIOUS</AttitudeType>
<iNoWarProb>60</iNoWarProb>
</NoWarAttitudeProb>
<NoWarAttitudeProb>
<AttitudeType>ATTITUDE_PLEASED</AttitudeType>
<iNoWarProb>90</iNoWarProb>
</NoWarAttitudeProb>
<NoWarAttitudeProb>
<AttitudeType>ATTITUDE_FRIENDLY</AttitudeType>
<iNoWarProb>100</iNoWarProb>
</NoWarAttitudeProb>
</NoWarAttitudeProbs>
They seemed to high to me. Although they are the same as in standard bts.
I lowered these values by 20 points for each leader (except for ATTITUDE_FRIENDLY) and it worked. There is a lot more war going on in europe. At least declarations of war, the a AI is still very bad at attacking cities, but its more fun now. I also saw the AI ganging up against others, especially me

I changed some other values too, but i dont know exactly which one. I think it was iMaxWarRand and iDogpileWarRand but it is impossible to track the impacts of every little change.
I also lowerd the MemoryDecays values to make the AI forget about past events faster, and added entries for MEMORY_DECLARED_WAR, MEMORY_DECLARED_WAR_ON_FRIEND, MEMORY_RAZED_CITY to make the AI forget about such things too. (as suggested in this
thread)
I dont know what are good numbers for these settings but i see great potential here.