I just got off the phone with support, and here's my loose transcript:
Support: "Hello, welcome to Zune support, can I have your name please?"
Me: "John Smith" (not my real name)
Support: "Joe Wilson?"
Me: "No, John Smith"
Support: "Can you spell that for me?"
Me: "J-o-h-n S-m-i-t-h"
Support: "How can I help you today Mr. Wilson?"
Me: "I have a question about whether I can mount my Zune as an external hard drive."
Support: "You want to mount to the Zune an external hard drive? I don't think that accessory is available yet."
Me: "No, I want to know if I can use my Zune as an extra hard drive on my PC or laptop."
(back and forth a couple of more times)
Support: "Let me check with my superior"
(a few minutes later)
Support: "You can only move things on and off the Zune through the software, no other way."
Me: "Is this going to be a future enhancement?"
Support: "It's our first day, we don't know what direction they will be going with it."
Me: "Is there an email address I can send a suggestion to for this feature?"
Support: "At the bottom of the website there is a Provide Feedback link"
Me: "I don't see it"
Support: "It's our first day, they are still modifying it. Is there anything else I can help you with?"