Team Color Option For Gloves- For example, Gerardo Parra wore an orange glove with the Giants early in the season. It's possible to replicate this in-game by picking specific colors, but having a team color option would make the process simpler. It would also help his glove adapt automatically to the colors of his new team if he's traded away or signs elsewhere as a free agent.
The ability to add chin guards to Minor League players' batting helmets- As seen here. Pretty self-explanatory.
Not 100% sure if this falls under the "Equipment" label, but a dedicated template for pullover jerseys would be appreciated as well.