Chellian,
Permit me to say, welcome to FT!
Unfortunately, the only observations that I have are the ones posted on here already. TSA apparently claims the power to require a prosthetic wearer to permit touching (poking, prodding, etc.) for screening purposes. Personally, I have a couple of friends/coworkers who have encountered issues with TSA and the handling of their prosthetic devices.
Again, welcome to FT and I look forward to reading this thread (will add it to the list of links I have sent those friends mentioned above).