Yes!
Except how do I do that?
Use crazy hand, go into the iso of melee you want to mod, go into mr g&w's character, go to the list and click subactions (attacks only), and go through all his moves, and when you see something that says "Hitbox (20 bytes)", change the damage of that hitbox to 999 and change the base knockback to 500 and knockback growth to whatever you want. Then repeat until you don't see any more hitboxes, and click save (The damage of all the hitboxes might change back to a number like 418 or something, that's normal.). Repeat this process until all attacks are changed.
Note: For the special moves you'll need to go the subactions (all) and scroll until you see SpecialN. Click that and do the process. Repeat that process for every one of the special moves. (SpecialN is a special way of saying his neutral special. SpecialS is his Side Special, SpecialHi is his Up B, and SpecialLw is his down b.)
I hope this helps!