Littlebit a suggestion if i may... just use Xenon's edit and then run the query...
PHP Code:
ALTER TABLE user ADD postorder smallint(6) unsigned NOT NULL
and then instead of making the option in the newthread / newreply just make the option in the member.php where the user profile stuff is
but thats just what i would do

don't know how Xenon would or anyone else... regards...
g-force2k2