Here is an article on the hinged boot that the USFSA has been paying companies to try to develop. Apparently, it is close. RGirl, this should make your day.
Tim Goebel is interviewed, and it sounds as if he was interested. However, he has a contract with SP Teri that runs through May.
Tim had more injuries than I knew about as well as the boots (as we probably all suspected), too.
From what I have seen of these boots, I expect bootcovers would be the order of the day, if you were using them.