[XThreads] Thread Link

[RateU]

Edit your forumdisplay_thread template (I don't know whether you need a template prefix or not). Replace the {$thread['threadlink']} with {$GLOBALS['threadfields']['thread_link']}.

Edit your thread_link custom fields. Put {$GLOBALS['threadurl']} in the Blank Replacement Value (I don't know whether you want it a required field or not).
Select some usergroups in the Viewable by Usergroups setting (exclude Administrator). And put the {$GLOBALS['threadurl']} variable in the Unviewable Value setting.