I don't know if that was already proposed or not. But 2 little options could be very useful for transfers and loans.
For transfers first, that would be nice to be able to block the transfer to directs opponents. Like for example I'm in the first French league so I could set before starting the transfer that I don't want this player to be sold to a team from my division. In the aim not to make our opponents stronger.
And for loans, it would be very interesting to be able to validate or not a loan. I'm totally open to loan my young players but only if its to play. What's for to let him go somewhere he will not play? So justo having sometimes to discuss with the manager to be able to decide, one of my player went to a botteam and I'm not even sure he will play more than if he stayed with me.