maybe we need like a... high score list for the game (and mods, if the creator wants) and maybe you can send the score and best time attack online (cheat codes and god menus will disable the high score and time attack feature. custom charaters still have a chance to place their name in the high score list. a pic that says "CuStOm" next to the name will tell players if a custom character had got their name in the high score list.).
and there should be a sa mode for single player. (i know it is implemented in the game, but i was thinking about something to toggle on and off. enabling it will restart the gameplay. also, players can gain abilities if they can collect chaos emeralds.)
take your pick. they are merely suggestions.