Keep your eye on short volume but it means little to me until you see well above 50% numbers. Watch the MMs too. You can begin to figure out which ones are naked shorting to cover orders. Means little really.
I am sure people are willing to short these stocks but it is probably not that common and perhaps more of an intraday thing. Risk Reward is just not there due to the cost, liquidity and risk.
Just my .02
Ok what is missing from he filings, you have my interest.
News 
Market Data 
Discover 
