Agree this sounds great. You should talk to Gazebo - he hasn't done much with the mod recently, but I'm pretty sure he's open to more ideas like these.

(IIRC, he also doesn't have much lua experience so he may need a hand with these kind of changes.)
EDIT - btw, Sneaks, did you get my PM?
Don't despair, I'm still here! CSD has reached its XML-based maximum in terms of changes, so I am just waiting patiently for code.
You are correct, Seek I haven't worked with LUA in a very long time, and am terribly rusty. I would need some assistance if we were to flesh out the end-game mechanic (something I am highly interested in doing, mind you).
I have no problem with Thal integrating CSD into his mod, even if that means disabling/removing aspects of the vanilla version of CSD. Just let me know what you want to change so I can see the result (and possibly change vanilla). I created CSD for everyone, and have no feeling of 'ownership' it is 'open-source' in the loosest meaning of term. Just let me know what you are doing with it (no bank robberies, please).
There does seem to be a bit of misinformation circulating in this thread concerning CSD, however. While I did disable the 'Kill City-State' quest, I did not disable the AIs desire to conquer city-states. In fact, there is usually a wave of DOWs and conquests starting around 1850 in most games with CSD enabled. The difference is that the AI is more selective about which CSs is conquers (it targets CSs that are strategically significant to its neighbors) as opposed to random CSs.
IMO, CSD doesn't add tedium I wanted to avoid this as much as possible (thus the reasoning behind diplo units giving 55 influence 2 diplo units= alliance for some time).
Finally, the AI is terribly (annoyingly) good at CSD they kick my ass late-game on the higher difficulty settings. They do have a few flaws, however: they cannot do a diplo mission while embarked (even though humans can) and they sometimes 'forget' about a diplo unit and leave him wandering about for 15-20 turns. Eventually they will use it, but they can be slow sometimes. I've never been able to figure out why this happens, as it is completely unpredictable. Oh and they have a bad habit of kamikaze-ing units right past barb camps in the early game and getting them captured.
Thanks for considering CSD, guys it took quite some time to create, test and polish.
-Gazebo