I know a lot of these have already been mentioned, but here are some of the things I'd love to see:
1. Football schools/ academies in other countries. Instead of having to search for affiliate clubs to get foreign youngsters, you can set up your own schools or academies in other places to bring these youngsters through. It could also have an impact on marketing (depending on where in the world you base it).
2. Nike Academy. I still remember the old days (and by old I mean FM10...) where the Glenn Hoddle academy frequently appeared playing friendlies. I would love to see this done with the Nike Academy. Every year they get a fresh squad of players which can be brought in on trial or signed permanently, perhaps useful for small clubs with poor youth facilities.
3. U-18/21's manager. I've wanted this in the game since I first started playing. Like playing with a 'B' side for some clubs, you don't have much control over who is available to you, but you get to be more involved in the development of the players, and perhaps include more involvement in selecting regens, linking with the academy idea for point 1, you can travel around to find these regens. Managing them would also link into my next point....
4. More player interaction, especially with young players. It feels like my manager is so cold, when the only times the player get spoken to are when they are in good form, when i'm fining them, or they have an issue and want to leave. I'd love more in depth interaction, perhaps bringing in more modern problems like social media, having to warn a player about what he's been saying, or even more extreme stuff like one of your players launching an attack on the rest of your squad (the next Roy Keane).
5. More 'realism'. I know that's a broad point, but its a broad subject. I'm talking about stuff like match day atmosphere, hostile fans, especially with your rivals. On the pitch, things like fights, personal grudges, more diving, things like that.
6. Club control. I'd love more control over my club. For example, setting how you want the stadium to be expanded. Maybe you want one large stand, or 4 medium size stands. Maybe you want a standing only area to encourage atmosphere, or things like that. Just generally being able to get more involved in how the club runs.
Any thoughts on these ideas?