I'd like to improve the security of edit codes. How do these options sound to you?
* Add a 'strength meter' that requires a certain length, like a password. This would be based on how hard it'd be to crack, rather than fixed rules
* Switch the custom edit code option with a tickbox, making it so that only randomised edit codes are possible.
* Prevent re-using the same edit codes twice within the same 2 hours on different URLs (checked per user, not against all users)