Hey all, a few suggestions I've spotted that may or may not have been suggested before.

Sounds/Music/commentary
Ability to build more than one team; perhaps a camp of U21/Senior Mens/Womens
Ability to build a one nation team using other teams players
Option to qualify for more competitions
Option to play "mini" games like a Sunday league team in-between matches to win rests/tokens etc
U21 squad management & games, ability to promote and sell at this level before main club promotion
Other income streams; stadium management, kit sales, season player loans
Fitness management; sale and purchase of phyiso, physical trainer, dietitian & medic etc
Captain skills