@Gyb I looked it over and it looks great, a few things I noticed that were incorrect/in need of elaboration are:
02.01.02 Champions
Janusk is not free, he's just really really cheap. Price is of course affected by charisma. I think at 10 charisma he costs 27 gilder. It's worth noting he's a +1 gilder champion generally so he pays for himself quickly, but even if he's a +1 tech instead you may not get the gilder back exactly but early tech research is great (and you can just research adventuring for a free gold mine).
+ 02.01.05 Influence +
Influence also alters the terrain to your ideologies type (grassland or whatever empires is called). When your units fight on your own land type they get bonuses to attack and defense, neutral land they get nothing, and penalties on the opposing ideologies land type.
+ 02.01.10 Technology +
The cost of researching techs in a particular tree increase the more you research that tree. So sometimes it's a lot better to spend 1 turn on a magic tech than 8 turns on a adventure tech. (or whatever you want to write)
+ 02.01.14 Combat, Tactical +
As long as you have at least 0.1 action points remaining you can perform any action. So if you have 1.1 and want to attack and cast a spell you can attack first then cast the spell (1.1 - 1 = 0.1 - 2 = 0) but you can't cast the spell then attack (1.1 - 2 = 0).
+ 02.01.15 Neutral Factions +
You can talk to neutral factions by initiating diplomacy with another faction and then clicking the 'left' and 'right' arrows beside the faction name at the top of the diplomacy screen. Just cycle through until the neutral faction appears. Note: you must have made contact first.
+ 02.01.16 The Store & Equipment +
Traveler's boots are restricted to the race of 'Men' (Altar or a custom faction) and Wayfarer's cloak is restricted to male 'Men'. No idea why, but that's the way it is.
+ 02.01.17 Quests +
You can tell if a quest location is available or if it's one that is still there even though you did it by zooming out to the cloth map. If it's brown you have been there and received the quest if it's gray (may vary for levels, can't remember) then you've never visited it before. Brown quest locations may also indicate a location you still have an active quest for.
I will read through the "In depth" section another day, but so far it all looks really good. I said already, but I'm really glad someone is doing this... lord knows I'm too lazy to actually compile everything into an faq/walkthrough like that.
