I wish there was a national team centric career mode option
I don't like that as a coach, you can only coach a national team if you also have a pro team to manage. This makes no sense, and there's far too much micro-management between the games that you'd have scheduled with your national team.
I really really want to see a career mode where you can be a national coach and ignore the club world for the most part. I think this would require having some new things in the game for club management, training programming, etc.
One thing that I do think would be really cool is if they took the drill system and applied it only to actual "camps" for the national teams. I know Team USA had a camp back in January at the start of their preparation for the World Cup this year. That was like a once a year deal that could be implemented in the game with less total drill opportunities but greater progression opportunity.