I'll respond to these point by point but such a mass generic idea blast such as this should be in the Ideas and Discussion thread since its not narrowed down to a specific subject.
1)An idea like that has been floated to potentially tie into the Changing Leaderheads project. This is looming on the radar but there's a lot of work in the way first (you'll hear this on most of these ideas so for the most part I'm letting you know you've been heard and giving you a status on the idea so far.)
2)The potential for this already exists under the Revolutions option but a new way this could take place may become a part of the Adopt a Culture project which is related to the above Changing Leaderheads project so would fall along the lines of being developed around the same time.
3)I'll have to give some thought as to how that could work exactly... may play into above plans or some of the other concepts below.
4)Basically Spies are terrorists depending on how you see them. But I've always wanted to have a different unit to represent terrorists that have their own particularly devious brand of spy missions. They could/should only come from having access to a terrorist group (which would operate along the Corporations mechanic and would be a close cousin of an Organized Crime group which would work the same way.) The idea of secret societies ties in so closely here too that all three would probably form a project of their own. But its not on the radar at all right now so it could be years, if at all, if we don't expand the design team.
5) Would work in perfectly with the Leaderheads as Units project which is the pinnacle of the projects that I mentioned in the first few responses. (changing leaderheads and adopt a culture) Additionally, DH is doing some things with Diplomat units and something to do with assassination may come into play in his work there (I dunno...).
6)I'd like to refer back to your ideas here when I start working on improving the UN. We need to do some work on those kinds of issues somewhat soon anyhow as we want to put in another step beyond the UN eventually (Galactic Federation).
7)Much of that falls under the development reach of aforementioned projects. Some of it would not apply, some of it would, to an extent.
8)I'm not sure what you're asking for here... there is always the map editor function that's been with us all along.
9)Interesting idea. Not my realm nor would it be a project I'd pick up considering all I'd like to do as a priority before this kind of thing. It'd be nice to have of course.
10) same response as 9... but then again, don't we already have this in the charting basically?
11) I had an idea along those lines that may eventually be incorporated into the Leaders as Units project OR in a Secret Society style mod... a couple of ways to approach that issue exist but are at the fringes of any kind of actual mod planning.
12)Interesting idea, but I don't see it as all too practical unless we eventually use multimaps to create zoomed in plotmaps for tactical battles which I don't think will ever happen unless we're still working on this a decade from now and computers could allow for it. Might be possible to mod it as you stated but I can hear Koshling moaning about the AI implications already
(and I'm harmonizing with that in the background, having an idea of what it would take... ooph).
Good ideas. Not meaning to shut them down... just understand that some of these are closer on the radar than others and due to the volume of effort some would entail they may never really manifest.