I am not sure how this will automatically log the user into roundcube and connect to the imap server. The imap server requires one to pass a decrypted password. Since Joomla encrypts with MD5, it is not possible to decrypt to get the password to send to the imap server. The patch I presented will let you wrap Roundube in Joomla, i.e., setup a menu item, so when you select that menu item you will go directly to your inbox in RoundCube.
I looked at the reference url's you mentioned and it appears they still require you to press a login button to login to RoundCube (imap sevrer). Also, how do you allow many users of your site to automatically login to RoundCube. It appears you can set up multiple sites for a single user, but how do I allow multiple users to automatically login to RoundCube usng a single menu item in Joomla?
Am I missing something?
David