[Mike]

I’m wondering if something like this could be used, to bring the categories over to the main column?

http://wordpress.stackexchange.com/questions/25793/how-to-force-one-column-layout-on-custom-post-type-edit-page

<?php
function wpse25793_move_post_metaboxes( $post ) {
    global $wp_meta_boxes;

    remove_meta_box( 'submitdiv', 'cpt-slug', 'side' );
    add_meta_box( 'submitdiv', __( 'Publish' ), 'post_submit_meta_box', 'cpt-slug', 'normal', 'low' );
}
add_action( 'add_meta_boxes_cpt-slug', 'wpse25793_move_post_metaboxes' );
?>