3) It took me a minute to figure out what you were talking about with the Magic and National overview buttons. As far as I'm concerned the National overview button is F1. I never use the mouse to get there.
2) Despite having an extra button to push, I much preferred the Dom2 version where "End Turn" took you to the host screen like it does when playing multiple nations. Especially since "e" does the same thing.
1) Not a criticism, but that probably means you're recruiting too many troops and not enough mages. Even in late game, I'll rarely be able to use up resources in more than 2-3 provinces. The capital if I'm still using capital only troops and one or two castles near the front. The bulk of the money goes into mages. So showing resources left wouldn't really help, what I want to know is where I haven't yet recruited mages.
And I know I'm done when there's no money left