What exactly is it?
In some games/applications that allow keybind/input sensitivity settings, the same preferences can be maintained on the same device even if you switch accounts.
When will you need this feature?
You want to help newbies grind their accounts, or you can’t play the game for a while and need friends helping for the events, etc.
How to make this feature?
Serializing control preferences into the application’s local file, not a complex feature.