Sorry, I'm not sure what you look for, then.
There's a global settings for WinSCP – the Windows registry. We do not recommend you to use it, as it's easy to break your scripts inadvertently. But if you insist to use it, do it.
Alternatively, you can use the INI file, if you want a shared settings storage for your all scripts isolated from the global registry settings. Yes, INI file can be deleted. But anything can be deleted. What kind of undeletable storage for settings do you have in mind?
There's a global settings for WinSCP – the Windows registry. We do not recommend you to use it, as it's easy to break your scripts inadvertently. But if you insist to use it, do it.
Alternatively, you can use the INI file, if you want a shared settings storage for your all scripts isolated from the global registry settings. Yes, INI file can be deleted. But anything can be deleted. What kind of undeletable storage for settings do you have in mind?