1. Trade Coach's
That way you could trade your head coach or another coach to another player for his head coach or another coach of his.
2. Trade GM's
That way if you don't like the GM you have you can trade him/her to another player's GM.
3. Trade Leagues
That way if lets say you want to in League 1 you can trade pigskin league to someone in League 1 where they play in pigskin league and you get to play in league 1.
4. Trade LOGO's
That way you can shake things up by changing your logo for your team.
5. Trade Players for Coach's , GM's , Logo's or Stadiums .
This way you could trade a player for someone's coach , someone's GM , someone's logo or even their stadium they play in instead of only being able to trade players for just players and/or draft picks.
6. Trade Stadiums
That way you can trade lets say Lambeau field for the Superdome
7. Trade Teams
that way you can trade teams where you dont have all different teams to where you could have all the same team in each league your in like for example you try to get all the San Francisco teams instead of having multiple different teams.
8. Add more teams in the trade menu
So instead of trading between only 2 teams you could trade between 3 teams or more though somehow you would have to make it where the trade , the salary cap , the draft picks and the players involved would work for all the teams involved or it gets rejected.