One thing that I feel in GC2 is that I never really seem to have "control" over my civilisation and that I have to just remember what planet is doing what and who is where.
I'd like to see perhaps the "focus" of a planet (research, military or civil) as well as the number for these stats on the planet list screen. This would help me to see which planets I'm using for research could be quickly refocussed for military production in times of war (ie. the ones that have a shipyard). Perhaps it'd be nice to be able to change the focus from the planet screen - so during times of peace you can quickly push a lot of planets over to research.
Also, the number of free "tiles" would be nice, to see which planets can have new things built.
I'd like to be able to disable the "we've researched a new tech!" messages as an option perhaps. I sometimes find that in the middle of a war, I'll end a turn and a lot of things will happen. I want to respond immediately to an attack, but then I get plagued with screens of "Research completed!" and "Here's the news!" and "We've found something on a planet, what should we do" or "Hey, pay us money or we'll come after you". All nice things on their own, but when it's war I want to not be distracted at the start of a turn. How to deal with this in an easy-to-fix-manner though, is tricky. I haven't had any good ideas on how it could be resolved, without a lot of code.
I'd like to know when two civilisations declare war on each other. At the moment I find that I'll be happily trading and then suddenly a trade route is cut off - and I then find that two AIs have gone to war. Well, thanks guys!
A while back I made a thread about UI tweaks I'd like to possibly see (though some were indeed trivial and can well be forgiven

). One that I would really like to see is the glow of "relation status" around each of the civ logos on the relations screen, relative to the currently selected civ. An alternative, maybe easier fix could be to add the civ name to the logo - I still have a hard time picking up which civ is which just from its logo.
I found it hard to find where to break an alliance. If you make an alliance by speaking to, it makes sense that you should break an alliance by speaking to (except unlike "normal" trades, breaking alliances must always be a deal - unless the player has added something like "break alliance and give me all your money" - that would be a no deal

). I found it illogical that the "break alliance" was a checkbox that takes over "trade embargo". I can't remember, but was there any confirmation for selecting this dramatic action?
I'd like to be able to complain to AI about it building starbases in my influence field. If they can do it to me (and I ignore it), surely I could complain to them too - even if they ignore it as well? Hahaha... well, perhaps if you've got a massive military and they don't, they might rescind. At least it would make me feel better about annoying AI starbases
How can I tell when a major race is at war with a minor race?
Happily, with the 1.11 patch, things are getting better. The AI seems to be getting more clever, some UI issues were fixed. Good work