Whilst in edit mode, a user could tap on the substitute toggle icon, this would present a new modal whereby additional hardware and system toggles alongside extra app shortcuts can be selected as suitable replacements. New toggles could include Low Power Mode, Personal Hotspot, Cellular Data and Location Services. Users could also add application shortcuts to compliment the existing Camera, Timer and Calculator functions, these could comprise of a link to the Settings app, marking a location, getting directions or starting a new note for example.
An important factor to consider when implementing additional services is that Control Center can be accessed from the Lock Screen. It would be imperative to require user authentication with a passcode or Touch ID if the particular action, such as opening the Notes app for example, could expose potentially personal information about the user.