Apologies if any of these have been mentioned --
Moneychangers seem to have no effect. I regularly build them, and have done so across multiple games, but never experience any rise in gold per turn. I seem to recall some other money-effecting buildings not working either (Tax Office?). Markets, at least, work fine.
A brief Pedia entry regarding the Domination spell would be hugely welcome -- to the effect of, "If your Domination attempt fails, your spellcaster reverts to the target creature's empire". Sort of a nasty surprise awaiting your Archmage, there.
I hate the "Altar of Luonnatar" (sp?) victory option. A civilization who regularly gets Great Prophets, for whatever reason, is guaranteed to win out long before any other victory condition presents itself. I got snarked by the fourth-place team in a recent game, and things were still early and competitive. Maybe turn the option off by default?
Any thought to having Spell Extension grant Conjurers the ability to hold their summoned creature for longer than one turn?
Fantastic mod! I can't wait to see where it's going in the future.
Foul