[wizofaus]

I had two thoughts...

a) handicaps? might not work for all sports, but worth looking into surely.

b) instead of a hard "male at age 12" rule, allow the athlete to undergo a series of tests to demonstrate their physiology is in line with that of a female rather than a male.

But...realistically these decisions should be left to the experts.

(BTW I'm pretty sure your statement "They just feel like women. Sorry, but physical development doesn't care about your feelings." isn't really accurate for many such transsexuals - the reasons they decided to transition are just as much biochemical as anything else. And if it weren't true, then there's no issue - they just compete in the "men's" category).