Hi Sam,
Thanks for posting here!
From the post, I understand that you would like to know if the users created by SteadyState use domain credentials can access network resources.
Sam, I have noticed several articles regarding this kind of issue, please refer to the following articles and threads.
One possible workaround is configuring default printer for the domain accounts from the server side
http://forums.microsoft.com/WindowsToolsandUtilities/ShowPost.aspx?PostID=2553303&SiteID=69
domain users
http://forums.microsoft.com/WindowsToolsandUtilities/ShowPost.aspx?PostID=2339592&SiteID=69
SteadyState Printing Issues - Access Denied
http://forums.microsoft.com/WindowsToolsandUtilities/ShowPost.aspx?PostID=2824919&SiteID=69
SteadyState on domain Computers
http://forums.microsoft.com/WindowsToolsandUtilities/ShowPost.aspx?PostID=1865467&SiteID=69
Best regards,