The attach to unit check box, may or may not work for allies. It has unpredictable results. I've lost many 1K units that way..... It needs to lock the other units in place dependibly. Maybe have a desired army with it. eg I would like 10 infantry and 10 cannons to attach to this army that I am leading (probably too complex, but oh well, it would be awesome).
Allow us to lead other nations units to war in overseas locations. It is difficult to attack England with allies the way things are. Of course, we could use this for evil by leaving them there, breaking the alliance, and declaring war on them....
Transfer siege control. I can take an allies province by moving out of the location and back in on the same day (if the ally follows me). I would like to be able to take over a siege leader if I am the war leader.
I would like a popup and pause when a rebellion reaches 90%. -- really, please do this!
I would like a build in best location button. I know I need more manpower. Can I just hit a button to build an arsenal in the best available location? Can I just build 5 temples where they would be most effective without having to scan my provinces for the best location?