I've been following this mod since its earliest stages and I can not stress enough how good it is. Definitely what makes Civ4 stay in my hard drive.
I've been playing with the Sheaim, discovered 2 of the 3 initial religions and decided to go for veil. Hyborem appears, I converted immediately to avoid a war and proceeded. Everything was going well... until I realized that the flood plains on which I built my capital were catching fire as if they were desert. My capital city cannot work those 7 tiles with farms anymore. So the price for summoning Hyborem has been loosing almost half of my population in my capital... which used to be my best city. Painful, painful... Spring is useless since although it does extinguish the fire, allowing my workers and units to pass (thanks god or my territory would have been split in two), it does not allow the city to work those tiles. My question is if it is intentional... had I known it I would have either not summoned Hyborem or else terraformed ALL my deserts and floodplains into plains first. In any case I think there should be a way, at least for Veil and/or evil civs to work those tiles. I think it would be a bit unbalanced otherwise. Perhaps after researching a specific tech, elementalism, for instance..?
Congratulations for a superb mod.