Not every example needs to be spelled out in black and white and signed by a wrinkled man with a long grey beard. The handful of Designers at Paizo have busy enough schedules already.
With all due respect, I see no issue with asking for official rules clarification to a product from a company whose product I'm having issues with. If you can't spare the time (or money) to hire people to answer your customers questions concerning your product then you have a poor business model.
I would be quite a feat to write down every single thing the Racial Heritage feat allowed you to qualify for.
Did I ask for every single thing the Racial Heritage feat allowed you to qualify for? I merely asked for official clarification on Prestige classes as concerned to the feat. I'm not concerned with anything else. Please don't make it seem I'm asking for more than I am because I'm not.