@Kael: If the event probability can be changed individually by era, how about leaving it as it is for the ancient era and increasing it for subsequent eras? Subjectively - and I've read the same from other posters - it seems you get lots of events in the beginning and too few in the later game. This of course is due to the increasing length of the turns - seems to me this could easily be fixed in this way and many (maybe most) of the fans of this mod would like the change..
As long as the implementation of religion-specific graphics hasn't been changed since the last statement I read about this won't work. There are no "real" eras in FFH as each era represents a religion (thus the changed graphics and music) and thus it is independent of game-length. Perhaps there is a possibility to add influence by number of turn or similar...