It lets you save the template or texture map while unregistered. I don't think it lets you save the remapping changes without registering.

Under file is "Save Template" or keyboard shortcut Ctrl+T  You can make different templates for an object if they overlap (like for a character).  Use the select tab to select the groups you want on your template then use Select Inverse to select everything you don't want and hit your delete key.  It won't change your obj file, just allow you to create the template for those parts.

I just woke up so I'm not sure how lucid that explanation is.  Let me know if you need step-by-step.  Does anyone know if Steve Cox frequents the message boards here (and what his user name is)?