Nice compilation. Most of it I knew, some I didn't (like the faction_capability thing). A few points (well, okay, at least nine):

1) I've heard it said that farming_level bonuses on non-farm buildings don't work unless a farm exists with that level or higher. So a +1 farming_level bonus on a temple does nothing until you build Land Clearance. Interestingly, the farms have their bonuses stated without the "bonus" tag, while the farming temples have it. Could this be related somehow? And what triggers the visible farming development you can see on the strategic map?

2) What does building_factions do? What's the syntax for building_present?

3) Are the limits you state for capabilities the actual limits, or just the limits used in the vanilla files?

4) Have you discovered that the races/games number means anything? I don't think races 1 is any different from races 3, but I'm not totally sure.

5) Negative values, in general, work only to reduce an existing bonus, not to create a new penalty. For instance, a negative law bonus will offset a positive law bonus, but not result in a law penalty to public order or income. A negative trade bonus, however, will reduce income by itself, since there's practically always a trade bonus present on the settlement screen (I think). Likewise tax. I don't know if this is always true, but it holds at least some of the time, AFAIK.

6) The factions { slave, } requirement appears to never be true, as far as I can tell. Rebels use their subfaction to fulfill EDB.txt requirements.

7) The functions of some of the bonuses might be useful to explain:
  • Each point in law gives +3% to gross income (farming + trade + taxes + mines), but that bonus is limited to the amount of corruption (see here).
  • Each point in farming_level increases the base farming level of the region by one, which increases growth by 0.5% (IIRC) plus income by either 0 or 80 at normal difficulty with normal harvests (see here).
  • I've heard that taxable_income_bonus and trade_level_bonus increase taxes and trade by 1% per point.

8) Are you going to incorporate anything from Quietus' guide?

9) I think the max number of hidden resources is 63, not 64.

-Simetrical