Similar to the Quick Training Editor and the Quick Tactics Editor, I'd like to have a view that helps manage some of the other player aspects. I'm thinking something simple to allow you to view certain aspects of the player that currently you have to go into each player to view; something that is difficult if you have a large number of players to manage.
I think a simple table view showing the player's name, team, contract end date, player note, and attribute sharing. Each column should be sortable by clicking on the header. Player Note and Attribute Sharing options should be changeable in view. Bonus would be if you could set the attribute sharing to the same thing for all your players at one time.
This would allow you to open or close your builds easily, see what players might need to look for a team because of a contract ending, etc. If you use your player notes to tell you where players are going, then you also know quickly and easily who is still going to be a free agent vs who you've promised to somebody.
