You can assign other roles to buttons in place of their existing roles.
This lets you move functions to easily-operated buttons and assign menu items and the like to buttons for quick access at the touch of a button to suit your shooting style. For example, you can activate ［Keystone.Comp］ or ［Fisheye Compensation］ or set ［AF Limiter］ or ［Preset MF］ simply by pressing a button.