Modifying Plugin Features

Completely override theme features, including only what you want:

function override_gb3_custom_theme_support($bsg) {
    $bsg = array(
                        'bsg-sidebars',
                        'bsg-add-head-markup',
                        'bsg-bootstrap-markup',
                        'bsg-footer-creds',
                        'bsg-genesis-setup',
                        'bsg-image-display',
                        'bsg-load-assets',
                        'bsg-footer'
    );
    return $bsg;
}
add_filter('bsg_modify_theme', 'override_gb3_custom_theme_support');

Add bleeding edge features not included by default (while also including default features):

function add_to_gb3_custom_theme_support($bsg) {
    $theme_extras = array(
                 'bsg-panels-widget'                     
    );
    // combine the two arrays
    $bsg = array_merge($theme_extras, $bsg);
    return $bsg;
}
add_filter('bsg_modify_theme', 'add_to_gb3_custom_theme_support');