Index: includes/admin/users.php
===================================================================
--- includes/admin/users.php	(revision 4796)
+++ includes/admin/users.php	(working copy)
@@ -56,6 +56,9 @@
 
 		// Process bulk role change
 		add_action( 'load-users.php',             array( $this, 'user_role_bulk_change'   )        );
+
+		add_filter( 'editable_roles',             array( $this, 'add_dynamic_roles_to_wp_new_user' ) );
+
 	}
 
 	/**
@@ -245,6 +248,18 @@
 		// Pass retval through
 		return $retval;
 	}
+
+	/**
+	 * Adds bbp custom roles to the new user role dropdown in the admin
+	 *
+	 * @param $all_roles
+	 *
+	 * @return array
+	 */
+	public function add_dynamic_roles_to_wp_new_user( $all_roles ) {
+		return array_merge( $all_roles, bbp_get_dynamic_roles() );
 }
+
+}
 new BBP_Users_Admin();
 endif; // class exists