I have a few suggestions that you'll want to hear :)

[Corndog52]

I'm pretty sure that all of the games included in Super Mario All-Stars (and the + Super Mario World edit) use the same level engine as Super Mario World. That being said...

Ideas:

*Depending on the game you chose, that will be the physics for your version of Mario or Luigi (or Peach or Toad if Super Mario USA/Super Mario Bros. 2 was selected).

*Any levels/courses/stages will be chosen to be part of that randomization.

*Could you make the randomizer also work for...
[Super Mario World 2: Yoshi's Island]
[Hacks of Super Mario World, including other ROMs put in the randomizer]
[Hacks of Super Mario World 2]

Thank you for reading this.

P.S. I realize that seeds would be trickier to work with due to cross-game compatibility hopefully going in the works.

[authorblues]

I'm pretty sure that all of the games included in Super Mario All-Stars (and the + Super Mario World edit) use the same level engine as Super Mario World.

It doesn't.

Depending on the game you chose, that will be the physics for your version of Mario or Luigi (or Peach or Toad if Super Mario USA/Super Mario Bros. 2 was selected).

I can't.

Any levels/courses/stages will be chosen to be part of that randomization.

It won't.

Could you make the randomizer also work for...

Not even one of those. None of those are possible.