Great but may I make a suggestion?

Sorry for the delay in replying – I’ve been tied up on other things.

Yes a great idea!

To change it to title, put this in your functions file

function rw_custom_freshness_link( $forum_id = 0 ) {
		$forum_id  = bbp_get_forum_id( $forum_id );
		$active_id = bbp_get_forum_last_active_id( $forum_id );
		$link_url  = $title = '';

		if ( empty( $active_id ) )
			$active_id = bbp_get_forum_last_reply_id( $forum_id );

		if ( empty( $active_id ) )
			$active_id = bbp_get_forum_last_topic_id( $forum_id );

		if ( bbp_is_topic( $active_id ) ) {
			$link_url = bbp_get_forum_last_topic_permalink( $forum_id );
			$title    = bbp_get_forum_last_topic_title( $forum_id );
		} elseif ( bbp_is_reply( $active_id ) ) {
			$link_url = bbp_get_forum_last_reply_url( $forum_id );
			$title    = bbp_get_forum_last_reply_title( $forum_id );
		}

		$time_since = bbp_get_forum_last_active_time( $forum_id );

		if ( !empty( $time_since ) && !empty( $link_url ) )
			$anchor = '<a href="' . esc_url( $link_url ) . '" title="' . esc_attr( $title ) . '">' . esc_attr( $title ) . '</a>';
		else
			$anchor = esc_html__( 'No Topics', 'bbpress' );

		return apply_filters( 'rw_get_forum_freshness_link', $anchor, $forum_id, $time_since, $link_url, $title, $active_id );
	}

	add_filter('bbp_get_forum_freshness_link', 'rw_custom_freshness_link' );

If you want to display it as well use

function rw_freshness_display_title ($forum_id = 0) {
	// Verify forum and get last active meta
	$forum_id  = bbp_get_forum_id( $forum_id );
		$active_id = bbp_get_forum_last_active_id( $forum_id );
		$link_url  = $title = '';

		if ( empty( $active_id ) )
			$active_id = bbp_get_forum_last_reply_id( $forum_id );

		if ( empty( $active_id ) )
			$active_id = bbp_get_forum_last_topic_id( $forum_id );

		if ( bbp_is_topic( $active_id ) ) {
			$link_url = bbp_get_forum_last_topic_permalink( $forum_id );
			$title    = bbp_get_forum_last_topic_title( $forum_id );
		} elseif ( bbp_is_reply( $active_id ) ) {
			$link_url = bbp_get_forum_last_reply_url( $forum_id );
			$title    = bbp_get_forum_last_reply_title( $forum_id );
		}

		$anchor = '<a href="' . esc_url( $link_url ) . '" title="' . esc_attr( $title ) . '">' . esc_html( $title ) . '</a>';
		echo $anchor.'<p/>' ;

}

add_action( 'bbp_theme_before_forum_freshness_link', 'rw_freshness_display_title');

I’ll add these to my ‘bbp style pack’ plugin as they would fit better there, but may be a couple of weeks before I do

Wow cool, can’t wait ??

now added to bbp-style-pack, but further refinements to come !