I think anyone wants seriously to hack our account could do ugually without the Save Login, don't you think so? Indeed I don't deeply understand these worries about the "lack of security" that would follow after this feature, the "how" it could be possible; and honestly I never heard these concerns before now.
Players tend to share their metin2 folder to help people with patching issues. If we add this save login features, it will create a file with all your stored data in that same folder, and sharing it means giving free access to anyone who has that file.
A safer way is simply using a macro to register your logins. I doubt the average metin2 players know where the macro file is located and nobody would need your macro files at all.