You can do something like this:
 private static readonly string[] StaticPages = 
                                   {
                                       "FaQ", "Help"
                                   };
    /// <summary>
    /// Registers the routes.
    /// </summary>
    /// <param name="routes">The routes.</param>
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
        routes.MapRoute("StaticPages",
            "{id}", // url
            new { controller = "StaticPages", action = "Show" }, // defaults
            new { id = String.Join("|", StaticPages) }); // constraints
        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional }); // Parameter defaults
    }