I was once playing a hacked remake SMB1 which was made from with Super Mario All-stars. Anyway, I got bored, so I used a game genie code to always start the game with a leaf in reserve - just to see what would happen.
...AND to my surprise it worked. This got me thinking: Since they all share the same design and all on the same rom, would it be possible to make an ultimate Mario hack similar to SMBX, that would allow the player to utilizes all the standard game mechanics from SMB 1 -3 (and maybe also SMW too), all the power-up from 1 - SMW (Yoshi too), including the ability to pick up/throw SMB2 objects/characters, as well as be able to chose from the 4 characters (Mario, Luigi, Toad, Princess Toadstool) from SMB2?
Because I think that would be an AMAZING hack! I know that SMBX already exists, but something like this would be awesome for those of us that have soft-modded xboxs and want to play SMBX on our tv's but unfortunately can't!