As far as I know that there is no options like that to disable the messages.

But you there is the option for not allowing the newbies to PM, And apart from that, if you have any problem with personal messages, you can set the "Notify by email every time you receive a personal message: " option to Never. This will prevent you from receiving any PM notifications in your email.

check your Personal Message Options- https://bitcointalk.org/index.php?action=profile;u=;sa=pmprefs