When you specify a crompression preset in the config file, e.g.
$cfg['Export'] = array (
'format' => 'sql',
'compression' => 'bzip2',
'asfile' => true
instead of the selected compression "none" is used on the export page. The compression has to changed by hand to get a bzip2 file instead of an uncompressed sql file.
Tryed with the lastest release 3.4.1 on ubuntu 10.04 LTS and apache 2.2.14