Scripting AI faction's capital in btw campaign?

[Ishan]

Well the topic says for itself i want jerusalem to be the capital of egypt or turks when they conquer it as i what the pope automatically trigger first crusade on jerusalem not that damn cairo.
if i remove cairo as a crusade target in decsr_regions.txt the first crusade is called in 35-54 turns on vilnius which is not cool and is historically in accurate.
the retrofit mod seems to call the crusades on capital's only.
i.e.
Iconium if i add it as a crusade target for the turks which is their capital.
Cairo if i add it as a crusade target for the egypt which is their capital.
Vilnius if i add it as a crusade target for the lithuania which is their capital.

So i want a script so that i can set AI faction capital via a scripting in campaign_script.txt in btw campaign.

If i give jerusalem to egypt as their capital in starting through descr_strat.txt the crusade is always called on jerusalem in about 15-21 turns which is perfect but i want the ai-faction egypt to capture jerusalem first.

Plz see the attachments for further acknowledgment of the problem at hand.

[Gigantus]

One thing that seems to work: put the Jerusalem region on the top of the descr_regions file. The first crusade should go there.