Vantek: you may be right, the AI would do this, although there might be a choice to alter that behaviour by the declaration of the unit type and the unit type behaviour. I remember very well that Caravel's pocket mod had crossbows that did not skirmish back and forth and took shot in the face of even charging heavy cavalry and knights. I am quite hopeful that with a bit of modding work, artillery could stay in with being more meaningful and less overproduced for the AI.
Gaiseric: i am pretty sure that you can keep changing factions while a turn lasts and do actions for them - however you would certainly play only the faction that you end the turn with. Its also possible that the AI would still do his actions with all other factions other than the one you end the turn with, but i cannot vouch for this its pure speculation.
I tried recently to play rulers instead of factions, but i found out that a single ruler per faction was too little. Two could also be too little because the succession order can include aging brothers etc - but three gives a play time from 50 to 80 years approx per faction.I played an early campaign by playing in turn the Turks, the Byzantines and the French. It was really fun. While playing factions i had to pay more attention to faction stability and to the Royal family and line - there was more room for roleplaying in this way because there was not unlimited time to design things to the player's will.
Anyway, just thought to share :)
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