Add a custom support status to Buddy-bbPress Support topic.

functions.php

<?php

/**
 * Filter the available status to add a custom one
 *
 * Requires buddy-bbpress-support topic plugin
 *          bbPress 2.5+
 *          WordPress 4.0
 *
 * @param  array $allstatus the available status
 * @return array            the available status and your custom one
 */
function your_custom_status( $allstatus = array() ) {
	$allstatus['topic-working-on-it'] = array(
		'sb-caption'   => __( 'Working on it', 'buddy-bbpress-support-topic' ),
		'value'        => 3,
		'prefix-title' => __( '[Working on it] ', 'buddy-bbpress-support-topic' ),
		'admin_class'  => 'waiting',
		'dashicon'     => array( 'class' => 'bpbbpst-dashicon-hammer', 'content' => '"\f308"' ),
	);

	return $allstatus;
}
add_filter( 'bpbbpst_get_support_status', 'your_custom_status', 10, 1 );