Hi David, Since this is a customization, you can use any file you want with standard .NET System.IO or any third-party config file management library. It is not recommended to use localUserSettings.conf for custom values as this file's structure can change without notice. You are limited only by free space on the hard drive and the number of file descriptors, so feel free to use any other file.
If you need so store an option in CME, use IConfigManager interface.
Thanks
Genesys Technicla Support