Hello, I am wondering what kind of undertaking it would be in Super Mario Brothers 3 to make all of the mushroom powerups be Kuribo's Boot (big green boot from level 5-3). I always loved the boot and would like to play the whole game with it. Because this would make certain levels less playable, it would also be nice to push select and skip to the end of the stage, if possible. That's not as important as the boot though.
I have done a small bit of ROM hacking, so I'm familiar with FCEUXDSP (a fine piece of work). I am just wondering what kind of effort this would be in general, i.e., swap a couple of instructions or add a few lines of code, vs. manually change every level in the game. SMB3 seems like a thoroughly hacked ROM, so I'll bet the ROM is fairly well known.