If you are like me and finished the game but are still missing a a bunch of shoes, try this....
Put 12 minute quarters, turn off all rules, grab your turbo controller and turn on the A button after tipoff. Just let it sit there for an hour.
Do this when you go to bed or are tired. You will play a 48 minute game and unlock a pair of shoes every game or two without actually playing.
Make sure autosave is on and go into the menus after each game so it saves.