Yes, this is truth, i know this fetish long time, had even here in IRELAND (!) one client, who asked me to pretend a lady without an leg. I clasped my1 leg with strap and then I just hopped on one leg around.
Though, that this fetish is famous in Austria only as there are girls in Vienna, who work on a wheel chair, one of them does everything, she eat shit, let piss on her , let vomit on her etc, she advertise in austrian websites, but is ugly and old.
Here is an guide for such people:
http://www.devguide.org/, sometimes very nice girls there