In Ken Griffey Baseball on the 64, you could input a code when Junior came up to bat and he would hit a home run every time. And then you got to hear the legendary Dave Niehaus make the call: "Swung on and BELTED! That ball left a VApor trail! MYYY OHHHHH MYYY!!!
there should be a coaching decision you can make during the off season like "give steroids to player X" to improve their stats.