The man given the task of trying to avert another Caster Semenya saga admits it will be impossible to bring in a catch-all rule for intersex cases.
http://www.timeslive.co.za/sport/other/article556019.ece/Trying-to-avert-more-intersex-sagas
Professor Arne Ljungqvist of the International Olympic Committee's medical commission will chair a conference on intersex athletes in October. The International Association of Athletics Federations is due to ratify new rules next month.

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I like the way this man thinks! He is reported as saying "One of the most common intersex disorders is androgen insensitivity syndrome. These are women who have no receptors. That means they cannot even dope themselves with testosterone so you could say, ironically, they are the most female creatures you can meet."

As a late diagnosed low grade PAIS I personally love that idea!