From time to time it's necessary to lock the rear wheel to remove various bits from the bike.
FG special parts in Italy make a paddock stand that has a removable bar that stops the rear wheel turning.
It wouldn't be difficult to fabricate a similar setup to convert an existing single sided stand to do the same.
I have a website address for FG special parts but it doesn't seem to work.
See part number 96704AAA and 967041AAA in the ducati performance Catalog?
http://www.ducati.com/docs_it/bikes/.../pdf/SB_AC.pdf Ray