How to make settings hidden/gray out

I want to make some settings hidden or gray out so that the user can't change the settings

For example:
Security: "Remember password for duration of session"
Update: "Display information about update on startup"
NetworK: bij “When SFTP connection is rejected, knock FTP port”

Is this possible by registry setting?

No, it's not possible.

martin wrote:

No, it's not possible.

Ok, that's clear enough.
Maybe an option for the future for the next update...The application is a very strong tool, and in wrong hands it can do to much.

Will see if more people ask for this.