I think the Editors, particularly the in-game one need more features. Like doing transfers, or transfer listing players. The most annoying thing is when you just start a save and then a big player moves IRL and then you feel like starting again. Could just use the in-game editor and transfer him yourself.
 
Improved training such as training focus, training match, watch training
Improved tactics - firstly pressing areas/instructions, secondly bring back player swapping, thirdly be able to swap three players in triangles such as in a 4-2-3-1 where the 3 interchange
 
I would like to see career ending injuries! It shouldn't happen often but that would be neat to see. say a top player signed 5 games into the season his career is over.

or have physios recommended early retirement due to injuries. were you can talk to the player and decide to play on or not.

or the ability to have players withdraw from the match the day before due to confidence crisis etc.
have player busts up at training were discipline isn't enough but contract release or transferred/loaned
 
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