I absolutely love this mod, and I've got tons of ideas and suggestions for it, but I'm hesitent to start mentioning them all because, out of 60+ pages of comments, chances are many of them have already been made. However, this is more then I have any intent of actually reading.
I think this proves that this project is extensive enough to deserve it's own site and forums, which would make these sorts of discussions much easier. Are there any plans for this?
A few rough things I do want to mention, though:
The turn counter should be altered. There is no reason to have the accelerating timeline, or the BC/AD anymore. Might as well just set it to be 500/1000/2000 turns, one year per turn, starting at the year 0. (I never really liked the accelerating timeline anyway.)
The wilderness should be much more dangerous. I like the additions you've made, with the hill giants and skeletons, but there is so much room for further expansion in this direction. I'd like to see the wilderness be a truly frightening place that has to be gradually conquered and tamed, almost as difficult as conquering another empire.
Following with that, I think the starting units, that is warriors and scouts, should be made much cheaper. Everything else can stay the same price, but it would be nice to be able to pull together a substantial early-game army of primative units to help conquer the wilderness, and then keep them around and update them as you get into the late game. The combination of these two shifts would, I think, create a very interesting change in the game dynamic.
I'd also like to see animal spawn points. I don't know if this is possible, but I'd love to see something like a dragon roost sitting in the mountains, which spawns dragon animals when not in anybody's cultural radius. However, when you envelope it, it turns into a strategic resource, like horses, which allows you to recruit dragon riders. This sort of setup could work for a variety of fantasy animals (gryphons, basilisks, etc.) or barbarian races (goblins, orcs, kobolds, etc.).