Ahh.
Glad to here it's intentional, though I do wish I could add a few back in.
In fact, looking over this mod, I can only think of two things that could actually improve it. More civs/leaders (though that can improve any mod), and religions. I'd suggest maybe bringing in JARM.
Aside from that, this is a really complete looking mod. On top of that, looks to be really balanced. My hat is off to you. I really like the idea of having more of a reason to get Calendar early on (normally I only get it early if I have the misfortune of starting near a jungle heavy area, and it's the only area I can expand into.)