Yes, I see no harm in placing a high sell limit order. I confirmed with my brokerage, Merrill Edge, that shares held in my margin account can be loaned out without my knowledge. It is because I have a margin account that allows them to do so per the account agreement when I opened it. Shares held in a cash account cannot be borrowed. My brokerage would not confirm that my shares were used to short sell and when I pressed him on the question he would only confirm that shares may be borrowed. He would not confirm if placing a sell order on my shares would make them ineligible to be borrowed. So, with that, I decided to put a high sell limit order on my shares at a price I would be happy to have it filled.
I posted on the yahoo board a few days ago that I put a $400 sell limit order on my 83000 shares of NWBO. I don't know if it will help, but it sure felt good doing so. Gl nwbo longs.