in the datasource-setttings, it is possible to disable password saving.
Our request is to have this option in entry- or folder-level (with inherited)
You can set the Credential option to "None" on the folder level, and then "Inherited" on the entry level.
And you would like for your users to not be able to saves password at all on the entries? Because there's also user specific settings that they can user that will not affect the entry itself.