So I started a 0-turn campaign with Pergamon on RS 2.6 (BI .exe) and I've noticed a couple of strange building issues. First of all, once government determination is built, instead of having the annexation option there is the Parthian Satrapy building in its place.
It appears to serve the same function, as it lowers public order and increases taxes, but it seems a bit jarring to be building a Parthian Satrapy as Pergamon. This is simply an aesthetic issue, but a more troubling issue is the inconsistency with Pergamon's tax buildings.
As far as I've seen from the 2.6 campaigns I've played so far the tax buildings have been changed from their original state. In earlier releases of RS2 you had increasingly large law penalties with each level of tax policy built, instead of the newer and more realistic model of a large initial happiness penalty that is reduced with each successive level. Pergamon's tax buildings seem to follow another model entirely for some reason. The first level simply adds a 20% penalty to happiness, but then each successive levels adds another 20% or more to that penalty, with the fourth level reaching a 100% happiness penalty. This is completely inconsistent with what these buildings seem to be representing throughout the rest of the mod.
I was under the impression that the actual level of taxation your people were under was still represented by the normal tax option, (i.e. low, medium, high, and very high taxes) and thus the more you squeezed out of them the more unrest you created. There are traits that accentuate this in the mod so it seems to be reinforcing this notion. However, the tax buildings represent the efficiency of the bureaucracy put in place to collect those taxes. The more effective and refined the process gets (represented by each successive level of tax building) the more corruption (not the game mechanic) is decreased, causing increased revenue and happiness of your people. For example, corrupt tax officials that inflate taxes to line their own pockets are replaced, and taxes are assessed more proportionally with regards to wealth so that they no longer fall disproportionately hard on the less well off. These were real problems that plagued empires throughout history and inevitably the reform of such systematic corruption increased happiness and profitability.
I'm assuming that this is a mistake (most likely of simple oversight), seeing how drastically different this is from what I've encountered with other factions so far in 2.6, but I haven't played nearly all the factions in this version yet so I could be wrong. If it is wrong then I'd love to see a hotfix put out at some point seeing as Pergamon is one of my favorite factions for this mod (if the devs have time of course. I know this comes from your free time) If not I'd appreciate being pointed in the direction of how to go about changing them to match up with how they are implemented in the rest of the mod.
Thanks for your time, and hopefully this information will help in perfecting this great mod even further.