I have looked over the pros and cons and believe that
this change would not cause much additional headache.
In future core releases:
At a minimum: Would it be possible to change in the
./includes/checklogin.php all $http_post_vars with
$_request has been available with php v 4.1.0
At a maximum: Globally change all $http_post... with
IMHO: Looking only at the "post" does not necessarily