^^^As well as the above idea, the ability to not only transfer existing uniforms to another team, but also to change the colors of those existing uniforms would be great as well. I know you probably can't allow for shifting graphics on the uniforms, but I think being able to change colors isn't unreasonable.
For franchise, an option to either expand or contract to have more or less teams in your franchise, and then picking how many teams would qualify for the postseason would be great as well.
If someone wants to load a historic team that no longer exists (Already complete with logos, team identity, uniforms, and ballpark), there should also be an option when starting the franchise underneath "Load an Existing Team" called "Load a Historic team," where you would fine some renditions of each Washington Senators franchise (I'd personally love to see 1968, but use Griffith Park instead of RFK Stadium), St. Louis Browns, Houston Colt 45s, Boston and Milwaukee Braves, Seattle Pilots, Montreal Expos (I'd like to see 1970), and more. Of course it would be fantastic to see era-appropriate rosters for each season as well, but I understand that that would be way too much to ask for.
So, all of the ideas that I've proposed in this topic, as well as someone to create the 1969 roster again (Or at least an all-time greats 1960's roster), and I'll definitely buy that game as soon as it's available!