Actually, adding a button at the save "/etc/hosts" screen to force the implementation of the change would be helpful. If desired, a popup warning that things could go bad can added too.
@John Rushford is somewhat right in that trivial changes do need to be quick and easy. Even if you have to acknowledge a "Yes, I am absolutely sure I am not a total idiot, and got the change(s) correct" popup.
Perhaps adding a comment to the Jira ticket about a button to force the change live, and maybe a popup.