Greater AI intelligence for AI managers. Mangers should have a better perception of PA and protect and bring through the most talented youngsters. Heightened board difficulty. I.e. prevent the predictable gradual growth that occurs in the game from season to season as this is far from being relevant in real life. Case and point being Everton, David Moyes constantly receives no financial backing from the board however on FM its all too easy to improve the financial situations of a club. Disable FA Banning when complaining about Referee de scions as it is extremely unrealistic as if this were the case IRL then you would be seeing touchline bans on a weekly basis.
There should also be some sort of player manager interaction when signing a player and a fee as been agreed. For example you should be able to hold a conversation with the player where you tell him your plans for the clubs and his future - what kind of squad role you see him playing. Players under certain circumstances should be more willing to take paycuts as it seems in the current transfer systems that players are extremely unwilling to sign on for pay less than what they are earning which is not realistic. I.e. players frozen out of 1st team at big clubs should be willing to move for substantially less wages in order to gain 1st team football.
From a game stand point, Greater tactical options. For example defensive covering options where a player can have a setting to cover a player if he roams forward. Also allow for multi player pressing of the ball in certain situations. Tempo should no longer combine, the speed at which a team gets the ball forward and how long it takes for a player to make a pass. It should be possible to play with a slow tempo but move the ball around quickly -this should be more apparent.
Also Goalkeeper preferred moves is a must. Thing like, rushes out to the ball, attacks crosses, stays on line, releases the ball quickly etc.