I have no proof, but believe that CWRN did after some extreme manipulation attempts.
They had a false report of paid promotion resulting in CE, followed two weeks later by a false buyout offer with over 140 bash posts from 18 different posters in a single trading day causing chaotic trading. The CEO was pissed and said he would look into it - soon after, we got Trade-for-Trade.
Since then, it has traded much more evenly and predictably - far fewer bear raids. CWRN longs have greatly appreciated the orderliness that trade-for-trade brought to this stock. Seems to have had no ill effect on longs or people adding.
If you read the links I provided, you can see that companies undergoing reorganizations of various types go trade-for-trade. I assume that they may initiate change in status in some of those cases.
Z_Man over on the GRDO board did some good research on this as well around the first of March or so.
Would be a very good question to ask the folks at CNS. Please post what you find out.