How to Put Custom Taxanomy Meta Box in Main Column

Unfortunately WP is hardcoded to generate taxonomy metaboxes in that side location.

It is tad fragile, but possible to throw generated data around from one location to another:

add_action( 'add_meta_boxes', 'move_taxonomy_metabox' );

function move_taxonomy_metabox() {

    global $wp_meta_boxes;

    $taxonomy    = 'test';
    $metabox_key = 'tagsdiv-' . $taxonomy; // or $taxonomy . 'div' if hierarhical

    if ( isset( $wp_meta_boxes['post']['side']['core'][$metabox_key] ) ) {

        $metabox = $wp_meta_boxes['post']['side']['core'][$metabox_key];
        unset( $wp_meta_boxes['post']['side']['core'][$metabox_key] );
        $wp_meta_boxes['post']['normal']['core'][$metabox_key] = $metabox;
    }
}

More proper way might be to just nuke generated metabox and completely redo registration.

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