how to do it better ???

[Mem5]

By restoring the settings I guess you want to be able to set the setting back to its original value.
Just backup the config BEFORE applying the patch.
eg. for Windows
- Backup the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers
- patch
- restore the backup if needed (but I don't know why you would need that..)