I've been thinking of somekind of "Fan Popularity" among the players and the manager. Players like Raul, Gerrrard, Terry, Giggs etc. are players who are faithful to their respective clubs and would probably never leave the club's side. Of course, the Informatation tab offers" favoured personel/icon/legend but doesn't really give a picture of _how_ popular the player/manager actual are among the fans. Fan culture is definitely are huge aspect of football and being able to combine this with being a manager, manage the team, the economy, the player's amibition etc. could maybe create some chaos and hard decisions as a manager. Whereas fans just want to keep their favourite players at the clubs the manager/higher management maybe have to think about other aspect outside the football pitch. This could maybe turn into a "fan riot" if trying to sell a player to raise money for the club's bad economy. Or if the player leaves due to "wants to move to a bigger club" the fans maybe feel disgusted by the player (and could maybe give him a hard time the next time he plays against his former team).
To make it short, I believe FM needs more fan interaction and feedback than just "happy/disappointed with the win/loss against X" or "Fans happy by new signing". Of course, fans does not have any real power, but they can utter their opionions on transfers, club take over, tactics (e.g. Barcelona/Real Madrid fans wants entertaining football) etc.. This could really make your decisions harder to make and maybe create your own "love for the club" instead of thinking financial just because you get a £60M offer on Gerrard.
Will the fans love you... or hate you?