A little bit different, but: in Austria, a special system was developed to allow jūjutsu shiai for our mentally handicapped budōka. The participants are on fire to show what they can do, and are a real inspiration regarding their enthusiasm and joy, as well as their knowledge of being jointly winners, completely regardless of individual results. Better than most non-handicapped persons they understand, that budō means to strive to become better than yesterday, and not to be better than someone else, and to preserve that idea even during shiai.
Here is a video from 2011 showing the competition (starting at 8:21):
The following report was issued prior to the JJIF-World Championships 2012 in Vienna, were the system was demonstrated during the official opening ceremony (sorry, in German language only):