Ability to Add
Extension Password (wont affect login just usage of security options)
(for PKI/PGP Else files are store Encrypted against or using PKI log-in for users opting to use digital keys on web-mail.)
PKI Options gen www.yoursite.foo / gen exportable GPG keys and store them in secure fashion
Base 1 web-mail PKI keys integration like hush-mail but free would be a nice option , open-ssl pki gen gpg etc most user however dont have shell access or know how etc.