There isn't a great deal of room for adding bells and whistles, especially at the racy end of the market. You can look for more pockets and things like that, but the extra features tend to come in the form of more advanced materials. More aerodynamic fabrics that help the airflow detach, or more breathable fabrics for the hottest days. Even compressive fabrics to support your muscles can be found if you want to pay the premium for the claimed benefits.