When customizing buttons for app-specific use, it would be nice if there was an option to select "use general setting" or "use global setting", something along that line. That way, if you had a general-purpose customization that should be the same across multiple or all app-specific customizations, especially more complex ones like keystroke combinations, it wouldn't have to be set for each app-specific setting, it could just use the global/parent setting with a single click.