How do I create a passwordless keychain? How can I create passwordless keychain on OS X? Specifically, I'm wondering if it's possible to sign application without keychain storing p12 and developer certificates

Using 10.7.1 OS X
Hold down Option when clicking OK with a blank password; Keychain Access will allow it.  Just worked for me on El Capitan.  Note-- when you log in (with a password) you will have to press OK to unlock it.