this is a few suggestion from me..
1) Add swap transfer option ( + this 1 i think not possible because it will help cheater a lot in thier work )
2) Add loan transfer ( + this will help player that hard to get in 1st team to gain EXP )
3) Manager can set thier youth player name when promoting them from academy
4) Player got special ability such as :
"long range shooter , freekick specialist , corner kick specialist , penalty saver , one-on-one finisher/stoper "
5) Player can learn new position
anyway , GKO is the best!!