After HOURS of fighting this, I finally found this post.  I can't believe you guys still don't have a way to set a designated authentication for approved apps so we can keep 2 part authentication and have external email clients.  Your Webmail is completely inadequate for business use.  The least that you can do is help us keep our security and allow seamless support for 3rd party apps that all need this same feature.  Please provide an update as to whether this is even on your scheduled upgrades.