Aye, Culture per pop is indeed possible, it just requires a 3rd party mod. Nonetheless, I've done it before with Florence Cathedral, so no reason not to do so. New version will be released with the next wonder.
i haven't actually built the florence cathedral yet, but i definitely do not have a 3rd party mod to support it---i thought this was no longer necessary. am i wrong?
also, re: CivOasis' last point, i'd agree. if i had a vote i think the river bonus is more interesting, whether it be culture or gold per river tile.
thanks again