To run fast, when you are running hold 'Z', and you will go faster.
Enter these in the cheats menu!
Big Balls: BCHBLKTPTY
To Fly back to dugout: FLYAWAY
Blurry Graphics: MYEYES
Smaller Players: TOMTHUMB
Baseball Trails: WLDWLDWST
Blackout Mode: WTOTL
With any man on base:
Hold the A button for 30 seconds
Hold UP on the control pad for 13 seconds.
Press A, B, UP, DOWN and START.