In this improved version:
- The `ShiftlockStarterGui` is given additional properties like `DisplayOrder` and `ResetOnSpawn` for better control.
- The shift lock icon image is set using a valid asset ID. Replace it with your own image ID.
- The `ShiftLockController` functionality is moved to a separate module script for better organization and reusability.
- The shift lock functionality is encapsulated within the `ShiftLockController` module.
- The shift lock button's click event is connected directly to the `ToggleShiftLock` function, making the code cleaner.
- The shift lock functionality is bound to the LeftShift key input event for convenience.
- The shift lock button's visibility is updated based on the user's device (touch-enabled or not).

Feel free to modify and further enhance the code to fit your specific requirements.