Your username and passphrase are already required to access your account so there is no need for a PIN entry system to access the feedback you've left. Every member is responsible for their own security and actions, and should be taking the necessary precautions to prevent falling victim to phishers and hiding their Tor Browser Bundle on a hidden encrypted volume if they desire no one to have access to it. Silk Road already does MORE than enough to protect buyers that choose to purchase from vendors here. People, both buyers AND vendors, need to employ a modicum of personal responsibility when using Silk Road! Libertas