This idea of "protecting the users from themselves" can be dangerous. Several very large corporations are currently telling their users to do very insecure things because telling them to use an extra option in some circumstances would be too confusing for their puny brains. Even though it's a security feature and doing things securely is kind of a big deal.

An extra field in an "Advanced Settings" menu should not need to be hidden behind some "Press About 5 times" secret gauntlet. Users are not so stupid that they will fill out an "Advanced" form field they don't understand, and even if they do, you can always make a connection attempt to see if the input was valid.