In customsettings.ini and bootstrap.ini, we can set UserID and UserPassword and UserDomain. The way I read one of the help articles, if you were using MDT from a non-domain computer, you should set:
UserID = PC Name\Username
UserPassword = your password
I was able to successfully deploy an image with this set like that. However, when I go to capture and manually add the information into the Capture Wizard window, it says that Domain is a required field. Should Domain be a non-required field, or can I put the Workgroup there instead?