I would be curious to know if someone has understood what is the file that controls how many brigands spawn units and with which, in descr_strat you can only set the spawn ratio of brigands and pirates but you can not do anything else, then there is descr_rebel_factions that I do not have understood if the game actually reads it or is not used because it seems to me that certain parameters do not match for example this:
It seems to me that other units also appear among the brigands such as the rebel general who is not mentioned here and non-mercenary units such as the peasants.
This makes me think that this file is not used also because I tried to modify it by putting 3 as a chance to all the possible rebellious subcultures but I don't think much has changed.
Then I would be curious to know the AI behavior of the rebel faction, I think it acts a bit like the senate, I don't think I have ever seen that it attacked a settlement with brigands even in cases where the brigands would certainly have won, I think it limit to keeping armies in a region although I have noticed that sometimes it moves them and only attacks weaker armies usually in ambushes.
The pirates instead make naval blocks and often attack the fleets of the various factions, now I was wondering what the behavior of the rebel faction is when it owns a settlement, the rebel faction does not run the risk of the settlement turning against it so I think that it will always go to maximum taxation a bit like the Senate will, these two factions in fact have a hard-coded bonus that even at 0% of public order the settlements never turn against them. Once I even caught a rebel diplomat aboard a pirate fleet, I think it was a diplomat from an annihilated faction whose armies, agents and fleets became rebels.
I am sure that the rebel AI when it has a settlement in its hands it builds and the culture of the construction depends on the culture to which those rebels belong, it seems to me there is a rebel culture for almost every region which in turn is a subculture of the 6 cultures of the game, I'm less sure about recruiting but I think it does, but probably doesn't recruit agents and fleets. In any case, it seems to me that even when they have a settlement, the rebels always remain on the defensive, at the limit they move reconnaissance troops but always within their own region, never seen an organized rebel attack against a settlement of a normal faction.
Sometimes the brigands also spawn with a family member I noticed and not a generic rebel general, in that case he usually is a good commander and defeating them requires more troops, I also wonder if the rebels are capable of "resurrecting" an annihilated faction as happens in the Paradox games if it occupies a province that originally belonged to that faction but it seems to me that it does not happen, however, they return the command of a region to the original owner if that faction still exists and the region was occupied by another faction.
I seem to have said everything, if someone has something to add or some doubt to clarify, add it as well.