"Work as if you live in the early days of a better nation"
Sorry but I'm not 100% sure despite your answer. English isn't my first language. J3.2 said: "Qualifying for Ruler. In order to become a Ruler..." It's that verb that cause me trouble... Nowhere is write something like "to become and stay a Ruler"... (or: to be a Ruler, ...)
Think of the Wazir cards as status markers. If a player is a ruler they get the card. The moment that isn't true, they lose it.
Other question: I suppose that the special actions "Consolidate" or "Regime Change" from the Persia's Wazir can be played "for free" if the current Regime is Political Fragmentation; same thing with the "Campaign" ability from the Transcaspian's Wazir if Military Struggle; right?
Correct. The special actions on Wazir cards behave like other special actions.
Third question: At the bottom of p.13 (E11.2), rules says "See section P". Can't find this section...
Ah that is a typo. I imagine the original redirect was just to J3.
Let me know if you have any more questions--and I'd encourage checking out the living rules. There were a couple of clarifications that have been built in since the game came out.