Is putting laminated stickers on the tops of the buttons of the Game & Watch to make doing flick jumps with Mav grip easier considered controller modification? What if I take the buttons out and coat them in super/krazy glue?

Controller modification refers to adding actual functionality like turbo or any kind of macro.

Putting stickers on a button or otherwise raising the profile of a button is fine as far as I am aware.

Ok, sweet! Thanks man!!