I would follow a different approach

Is the case == user
do the custom ordering
else for all other cases
$query .= " ORDER BY ".$orderby;

Line 337 approx.

Cheers Krikor for pushing me in the good direction.

Fixed it with this:

if ($task == 'user')
{

$query .= " ORDER BY i.neworder ASC";
}
else{

$query .= " ORDER BY ".$orderby;
}

Congrats :)

Remember to back it up so you won't lose it.