An owners/GM Meetings feature in Franchise can really diversify each Franchise you do. This is already in 2k. Some ideas of what you could vote on:
-Playoff Series lengths (already customizable in Custom Leagues and Postseason mode)
-Adding or subtracting the amount of playoff teams
-Universial DH or No DH league wide (already in the game)
-Adding or subtracting active roster sizes
-Pitcher Batter minimums
-Amount of Mound Visits
-IL lengths
-Date of trade deadline
-Length of season
-Perfect or imperfect strike zones