I have always wanted to do a Wind Waker mod whereby it is given back its fangs. Up the damage, lower the cash prizes, fuck with the drop rates. Hell, pretty much every 3D Zelda gets waaaay too generous with the random lawnmower-style grasspatch spawns. I do a lot of this "Wouldn't it be neat if....?" in my head with games I enjoyed, I think it comes from lurking RHN too much.
The Wii U port has a hard mode where there are no heart spawns from enemies/pots/grass and the enemies do double damage. Next time I play I might use that. However the game is easy because of the parry function and lack of enemy aggression, so I'm not sure how much difference it would make.