[Michael Adams (mdawaffe)]

Create a directory called my-plugins/ in bbPress’ root directory.

Into that add a new file called mod-write-topics.php with the following code.

<?php

function mod_write_topics() {

global $bb_roles;

$bb_roles->role_objects['member']->remove_cap( 'write_topics' );

}

add_action( 'bb_got_roles', 'mod_write_topics' );

?>

I think that will work, but I haven’t tested it.