Item description:

Open whole save in editor

Choose character and max it's score then save in editor

Repeat these steps for all characters

Rehash & resign

Info about Editor:

Code:
Individually mods all high scores.

After you mod and save your score, the editor will show -255 if you switch back to that character. That's ok, the score is still modded to what it should be.

If there's any bugs or something you don't like about it, let me know. I don't have the game myself and only had 1 save so this is possible.