1) I imagine it's too difficult, with the visibility system you've made, to allow Any unit on a barren/treeless hill to see the surrounding tiles. I understand the scout promo but the treeless hill and not being able to see the surrounding tiles is hard to take.
2) 1st 6000 years are basically 1 city and a lot of click turn click turn. Even having 3-4 cities by 100BC is pushing it. Is this so that the Tech progression sort of lines up for the later Eras?
3) Do you have plans to break up the Religion founding techs so 1 player doesn't grab most religions? And No I'm not advocating Limited Religions Option nor a Divine Prophet Option either. It's just an inherent BtS tech chain that allows 3 to 4 of the 7 Religions to be teched by the tech leader. Just the simple removal/break up of the Polytheism->Monotheism->Monasteries chain by adjusting the Prereqs helps tremendously in this regard.
4) Tech costs by Era is maybe something to think about. Currently the Tech costs are all over the place.
JosEPh
1) I actually had it at one time. You could see hills from 1 tile away, and on top of barren hill, would be able to see 1 tile surrounding. Might reimplement it, though iirc there was a downside with it. cant remember which though.
2) (and 4) The techtree is from RoM, and I have done very little to it. Added a couple and adjusted later era techcost. I do have problems getting to the different eras in time. sometimes. other times the AI (and/or myself) is actually ahead of time. But the Neolithic/Ancient/Classical eras are usually "late", and not in my preferred order.
So I took them up to revision :
But I completely agree that there is very little to do in early eras. I found myself selecting the Normal (x2 Unit and Building cost) speed, so atleast the city wouldnt stand on barter half the time. I can imagine the problem would be doubled on Epic. I thought about some early buildings (Healers Hut seems to be one of the most popular amongst mods

, but also a good building to provide the Recon promotion, and a Weavers Hut or something, and I looked at the BFC-resource building requirement modcomp, which could be used for some specific buildings.
Also the scout comes too late (Hunting, Stone tools AND Naturopathy is a bit too much).
However, playing on Normal speed, Colossal size and Emperor difficulty I actually got declared war upon at 100 BC by the japs who attacked with 2 Horsemen, 2 Rams, 2 Chariots and 1 Archer, (see screenie a couple of posts up) so the AI is actually doing pretty well (almost all their capitals were around size 12)
3) Limited Religions is actually on per default, so any civ shouldnt be able to found more than 1 religion. It can be turned off in VIPLoader though.
4) Could you be more precise?